| actinopterygian | Of or relating to the group Actinopterygii of bony fishes characterized by membranous fins supported by slender rays or spines. | 1890 | Go To Quotation |
| adelite | A rare arsenic-containing mineral which occurs as colourless to grey or green… | 1892 | Go To Quotation |
| adendritic | Of a cell: lacking dendrites. Also: designating this form or type of cell. | 1894 | Go To Quotation |
| agamid | Belonging to the family Agamidae of lizards. | 1875 | Go To Quotation |
| ahistoric | Not historic; unrelated to or unconcerned with history or historical events; = ahistorical adj. | 1911 | Go To Quotation |
| algeny | The attempt to ‘improve on’ or ‘perfect’ naturally existing organisms by means… | 1966 | Go To Quotation |
| allometry | In the terminology of H. F. Osborn: (measurement of) the evolutionary change in the… | 1912 | Go To Quotation |
| allomone | Any of various chemicals that may be released into the environment by an organism… | 1968 | Go To Quotation |
| anteclypeus | In the mouthparts of some insects: the lower section of a divided clypeus, situated… | 1883 | Go To Quotation |
| anuran | Of or pertaining to the Anura, an order of tailless amphibians. Hence as n. | 1900 | Go To Quotation |
| apomictic | Pertaining to or produced by apomixis; reproducing without sexual fusion. | 1913 | Go To Quotation |
| apomixis | Reproduction of organisms without fertilization (see quot. 1932). (Opp. amphimixis; see amphi- prefix.) | 1913 | Go To Quotation |
| arthrodire | A member of the extinct order Arthrodira of placoderm fishes, which are known from… | 1897 | Go To Quotation |
| axonost | In fishes, one of the interspinal bones; the basal portion of a fin-ray. | 1887 | Go To Quotation |
| Babesia | A genus of protozoans of the group Apicomplexa, the members of which are parasites… | 1900 | Go To Quotation |
| bimodal | Having two modes, esp. in Statistics (mode n. 13). | 1903 | Go To Quotation |
| bimodality | The quality or fact of being bimodal, esp. in Statistics. | 1903 | Go To Quotation |
| biospheric | Of or relating to a biosphere or biospheres (natural or artificial). | 1918 | Go To Quotation |
| biota | Animal and plant life (fauna and flora) considered collectively; the collective animal… | 1901 | Go To Quotation |
| bryozoologist | An expert or specialist in the Bryozoa. | 1921 | Go To Quotation |
| chalicothere | A perissodactyl mammal of the extinct genus Chalicotherium (family Chalicotheriidæ), with a horse-like head and clawed toes. | 1907 | Go To Quotation |
| Chelicerata | With pl. concord: a group of arthropods comprising the arachnids, horseshoe crabs… | 1919 | Go To Quotation |
| cheliped | One of a pair of limbs bearing large claws, or chelæ, found in decapod Crustacea. | 1869 | Go To Quotation |
| chrysomelid | Any of numerous small herbivorous beetles constituting the family Chrysomelidae… | 1871 | Go To Quotation |
| clonality | The property or condition of being clonal; the degree to which a population of organisms or cells is clonal. | 1966 | Go To Quotation |
| corpus allatum | In insects: each of a pair of small endocrine organs behind the brain which secrete juvenile hormone. | 1899 | Go To Quotation |
| Cubomedusae | With pl. concord. A group of cnidarians comprising the box jellyfishes; (also… | 1886 | Go To Quotation |
| cytoplasmic | Of or relating to cytoplasm. | 1885 | Go To Quotation |
| darapskite | A colourless or white mineral of the monoclinic crystal system which is a double… | 1892 | Go To Quotation |
| di-hexahedron | A six-sided prism with trihedral summits, making twelve faces in all. Also sometimes, a double hexagonal pyramid. | 1888 | Go To Quotation |
| diplarthrous | Having the carpal or tarsal bones doubly articulated, i.e. the several bones of one… | 1887 | Go To Quotation |
| diplobiontic | Designating a plant or fungus whose life cycle involves alternation of generations… | 1916 | Go To Quotation |
| disome | Any pair of homologous chromosomes. | 1921 | Go To Quotation |
| echiurid | Of or relating to the phylum Echiura (= echiuran adj.), or to the family Echiuridae. | 1884 | Go To Quotation |
| ectoproct | Originally: an animal of the bryozoan group Ectoprocta. In later use: a bryozoan. | 1878 | Go To Quotation |
| Ectoprocta | Originally: an order or division of the Polyzoa (Bryozoa) having the anus opening… | 1878 | Go To Quotation |
| ectotherm | An ectothermic animal. | 1940 | Go To Quotation |
| electrotactic | Of the nature of electrotaxis; exhibiting or characterized by electrotaxis. | 1897 | Go To Quotation |
| endotherm | Zool. An endothermic animal. | 1940 | Go To Quotation |
| entoproct | Of or relating to the group or phylum Entoprocta. | 1883 | Go To Quotation |
| Entoprocta | With pl. concord: a small phylum of minute, sedentary marine invertebrates borne on a… | 1878 | Go To Quotation |
| ergate | The worker ant. | 1901 | Go To Quotation |
| faunally | As regards the fauna of a district or epoch. | 1872 | Go To Quotation |
| foregut | The first or anterior part of the digestive tube, esp. in an insect or an embryo. | 1875 | Go To Quotation |
| gameto- | the formation of gametes. | 1887 | Go To Quotation |
| gene | The basic unit of heredity in living organisms, originally recognized as a… | 1909 | Go To Quotation |
| genotypical | = genotypic adj. | 1911 | Go To Quotation |
| genotypically | As regards genotypes (genotype n.); by means of the genotype. | 1911 | Go To Quotation |
| geotropy | = geotropism n. | 1888 | Go To Quotation |
| gigas | Of or designating a polyploid form of a plant which is larger and more vigorous than the normal form. | 1915 | Go To Quotation |
| Gloger | Gloger's rule (occas. law), the empirical principle that within a given species (orig.… | 1933 | Go To Quotation |
| gnathal | = gnathic adj. | 1888 | Go To Quotation |
| gnathophorous | | 1888 | Go To Quotation |
| gonyaulax | A dinoflagellate alga of the genus Gonyaulax, often present in red-water (redwater n. 4). | 1902 | Go To Quotation |
| haplobiontic | Designating a plant or fungus whose life cycle involves only one type of organism (which… | 1916 | Go To Quotation |
| haplotype | Biol. A species taken as the type species of a genus because no other was originally included in the genus. rare. | 1914 | Go To Quotation |
| hemizygous | Having a single unpaired allele at a particular genetic locus, as at all the loci in an XO… | 1921 | Go To Quotation |
| hypocone | An external cusp on the inner back corner of a mammalian upper molar tooth. | 1888 | Go To Quotation |
| hypoconid | A cusp on a mammalian lower molar tooth corresponding to the hypocone on an upper molar. | 1888 | Go To Quotation |
| hypoconulid | An intermediate cusp between the principal ones on the heel of a mammalian lower molar tooth. | 1897 | Go To Quotation |
| idiomorphism | The condition of being idiomorphic. | 1892 | Go To Quotation |
| immobilizer | gen. Chiefly U.S. A device or agent which immobilizes something or renders something inactive. | 1922 | Go To Quotation |
| intercentrum | A wedge-shaped or chevron-shaped process, generally situated between the centra, occurring… | 1878 | Go To Quotation |
| interrelate | trans. To bring into relation to each other. Also intr. | 1888 | Go To Quotation |
| intersexuality | The state or condition of being intersexual; intersexual character. | 1916 | Go To Quotation |
| invaginate | invaginated adj. | 1887 | Go To Quotation |
| kleptobiosis | Among ants and certain other social insects, an association in which a small species feeds… | 1901 | Go To Quotation |
| laparostict | Of scarabæid beetles: Having abdominal spiracles in the membrane connecting the dorsal and ventral corneous plates. | 1888 | Go To Quotation |
| lichenian | = lichenic adj. | 1889 | Go To Quotation |
| luminal | Of or belonging to a lumen. | 1897 | Go To Quotation |
| macrergate | A worker ant of a relatively large subcaste. | 1901 | Go To Quotation |
| macronuclear | Of or relating to a macronucleus. | 1920 | Go To Quotation |
| macrosomite | Any of several anatomical regions formed prior to the formation of true… | 1888 | Go To Quotation |
| madreporian | = madreporarian adj. | 1870 | Go To Quotation |
| marsipobranchiate | = marsipobranch n. | 1870 | Go To Quotation |
| Mecoptera | With pl. concord. A small order of predatory insects having biting mouthparts at the tip… | 1886 | Go To Quotation |
| mecopterous | = mecopteran adj. | 1895 | Go To Quotation |
| medisection | = hemisection n. at hemisect v. Derivatives. | 1887 | Go To Quotation |
| Medullosa | A genus (or form genus) of fossil plant stem found in Carboniferous and Permian… | 1885 | Go To Quotation |
| melanistic | Characterized by or exhibiting melanism; melanic. | 1873 | Go To Quotation |
| melanocerite | A translucent resinous fluosilicate of cerium and calcium occurring as black or brown tabular crystals of the trigonal system. | 1888 | Go To Quotation |
| melanosperm | An alga of the (former) subclass Melanospermeae, characterized by dark olive spores. | 1870 | Go To Quotation |
| meloid | A beetle of the family Meloidae, which includes oil beetles and blister beetles. | 1878 | Go To Quotation |
| merocyte | A cell or nucleus formed by division in a meroblastic ovum; spec. any of numerous… | 1888 | Go To Quotation |
| mesaxonic | Of the foot of an ungulate or (in later use) the hand of a primate: having the axis… | 1893 | Go To Quotation |
| mesenchyme | A loosely organized tissue, chiefly mesodermal in origin (e.g. the parenchyma of… | 1881 | Go To Quotation |
| mesocephal | A mesocephalic person. | 1883 | Go To Quotation |
| mesocephalism | = mesocephaly n. | 1888 | Go To Quotation |
| mesocephaly | The condition or character of being mesocephalic. | 1883 | Go To Quotation |
| mesocoelian | Of or relating to the cerebral aqueduct (mesocoele). | 1887 | Go To Quotation |
| mesodont | Physical Anthropol. and Zool. Having teeth of medium size. | 1877 | Go To Quotation |
| mesognathy | = mesognathism n. | 1884 | Go To Quotation |
| mesopterygium | In elasmobranch fishes: the central portion of the cartilaginous skeleton at the base of each pectoral fin. | 1871 | Go To Quotation |
| mesostyle | A vertical ridge on the buccal side of a mammalian upper molar tooth, between the front and rear cusps. | 1892 | Go To Quotation |
| mesothelial | Of or relating to mesothelium; consisting of or derived from mesothelium. | 1886 | Go To Quotation |
| mesotrocha | With pl. concord. The ciliated larvae (collectively) of certain polychaete worms… | 1875 | Go To Quotation |
| metacercaria | The encysted final larval form of a trematode (parasitic worm), into which a… | 1925 | Go To Quotation |
| metachronous | Biol. = metachronal adj. | 1903 | Go To Quotation |
| metaconid | A cusp on the posterior lingual corner of a mammalian lower molar tooth. | 1888 | Go To Quotation |
| metaconule | A minor cusp between the protocone and the metacone of a mammalian upper molar tooth. | 1888 | Go To Quotation |
| metakinesis | The separation of sister chromatids and their movement to opposite poles in anaphase of mitosis. Now rare and hist. | 1887 | Go To Quotation |
| metamer | Zool. = metamere n. 1. Now rare. | 1884 | Go To Quotation |
| Metaphyta | In form Metaphyta; with pl. (or occas. sing.) concord. The multicellular plants, as… | 1889 | Go To Quotation |
| metaphytic | Of or relating to a metaphyte; of the nature of a metaphyte. | 1889 | Go To Quotation |
| metapterygium | The prominent posterior cartilage at the base of the pectoral (and sometimes pelvic) fin in certain cartilaginous fishes. | 1871 | Go To Quotation |
| metatrophic | Designating a change in form or proportion of parts of an organism during its lifetime… | 1889 | Go To Quotation |
| metazoan | Of, relating to, or designating animals of the division Metazoa; characteristic of the Metazoa. | 1876 | Go To Quotation |
| Michurinist | Of, relating to, characterized by Michurinism; adhering to Michurinism. | 1946 | Go To Quotation |
| microanatomy | Microscopic anatomy; histology; the microscopic anatomy of a tissue, structure, etc. | 1880 | Go To Quotation |
| microevolution | Evolutionary change on a small scale or over a relatively short time period; spec.… | 1911 | Go To Quotation |
| microgametocyte | A gametocyte that gives rise to microgametes. | 1900 | Go To Quotation |
| microgametophyte | A gametophyte that develops from a microspore; a male gametophyte. | 1907 | Go To Quotation |
| micromineral | Geol. A mineral of microscopic size. | 1872 | Go To Quotation |
| microorganismal | Of, relating to, or caused by microorganisms. | 1888 | Go To Quotation |
| micropegmatite | Any rock with a micropegmatitic (micrographic) structure. | 1886 | Go To Quotation |
| microprism | A tiny prism; esp. a tiny prismatic crystal. | 1936 | Go To Quotation |
| microprojector | An apparatus for microprojection (microprojection n. 1). | 1921 | Go To Quotation |
| microsaurian | Designating or belonging to the order Microsauria of fossil amphibians; of or relating to microsaurs. Cf. microsaur n. | 1881 | Go To Quotation |
| microsomite | A definitive segment of the developing insect body; a metamere. Cf. macrosomite n. | 1888 | Go To Quotation |
| microsporidium | Any member of the protist phylum Microspora (formerly the suborder Microsporidia… | 1884 | Go To Quotation |
| microstructure | Structure on a microscopic or very small scale. Cf. fine structure n. 2, ultrastructure n. | 1881 | Go To Quotation |
| microtine | A rodent of the subfamily Microtinae (family Muridae) of rodents, which includes voles, lemmings, muskrats, and mole-voles. | 1895 | Go To Quotation |
| microtomic | Relating to the use of a microtome. | 1883 | Go To Quotation |
| microtomical | = microtomic adj. | 1887 | Go To Quotation |
| microtomy | The use of a microtome. | 1884 | Go To Quotation |
| midpiece | Chiefly Biol. A middle section or part of a structure, organism, etc. | 1886 | Go To Quotation |
| mid-sized | Intermediate in size. | 1883 | Go To Quotation |
| minutissimic | Extremely minute; tiny. | 1888 | Go To Quotation |
| miscanthus | Any of various tall tropical grasses native to eastern Asia and southern Africa that… | 1882 | Go To Quotation |
| misorient | trans. = misorientate v. | 1949 | Go To Quotation |
| missing mass | The amount by which a measured or calculated mass falls short of an expected or inferred… | 1889 | Go To Quotation |
| monodactyly | The condition of being monodactylous. | 1897 | Go To Quotation |
| monofactorial | Originally: = monogenic adj. Later chiefly: involving or dependent upon a single factor or cause. | 1920 | Go To Quotation |
| monomeric | Designating a flapping or waving motion in which all of a surface moves in the same… | 1880 | Go To Quotation |
| monosomy | The condition of being monosomic; the absence of one of a pair of homologous chromosomes; an instance of this. | 1931 | Go To Quotation |
| monotypical | = monotypic adj.; (Taxon.) = monotypic adj. 1b. | 1873 | Go To Quotation |
| Montian | Of, relating to, or designating a stratigraphic stage in western Europe represented… | 1885 | Go To Quotation |
| morassic | = morassy adj. | 1893 | Go To Quotation |
| mountain beaver | A burrowing rodent, Aplodontia rufa, the sole member of the family Aplodontidae, which… | 1877 | Go To Quotation |
| Mousterian | Designating or relating to a Middle Palaeolithic culture, following the Acheulean… | 1876 | Go To Quotation |
| mucroniform | Shaped like a mucro. | 1882 | Go To Quotation |
| mud pike | The grass pickerel, Esox americanus (family Esocidae). rare. | 1870 | Go To Quotation |
| mud sunfish | The warmouth, Lepomis gulosus; cf. mud bass n. (c) at mud n. 2b. | 1870 | Go To Quotation |
| multicelled | = multicellular adj. | 1884 | Go To Quotation |
| multifactor | Involving or dependent on a number of factors or causes. Cf. multifactorial adj. | 1916 | Go To Quotation |
| multimodal | Statistics. Of a frequency curve or distribution: having several maxima or modes (mode n.… | 1899 | Go To Quotation |
| multinuclearity | The state or phenomenon of being multinuclear. | 1887 | Go To Quotation |
| multituberculate | Of a tooth: bearing several cusps arranged in two or three rows. Also: of, relating… | 1884 | Go To Quotation |
| murid | Of or belonging to the family Muridae, which includes most kinds of rats, mice… | 1894 | Go To Quotation |
| muscid | Of, relating to, or designating the dipteran family Muscidae, which includes houseflies. | 1869 | Go To Quotation |
| muscovitized | Converted into muscovite. | 1897 | Go To Quotation |
| musk turtle | Any of several small North American freshwater turtles of the genus Sternotherus (or Kinosternon… | 1868 | Go To Quotation |
| mutating | That mutates or changes; causing or undergoing mutation. | 1877 | Go To Quotation |
| mycelial | Consisting of, relating to, or characterized by a mycelium. | 1867 | Go To Quotation |
| mycetocyte | Any of the large cells found in certain insects, esp. homopteran bugs and bird lice… | 1923 | Go To Quotation |
| mycetophilid | A fly of the dipteran family Mycetophilidae comprising the fungus gnats, whose larvae feed chiefly on fungi. | 1869 | Go To Quotation |
| mycoplasma | = mycoplasm n. 1. Now disused or hist. | 1895 | Go To Quotation |
| myodome | A cavity in the skull of most teleost fishes housing the rectus muscles of the eye. | 1888 | Go To Quotation |
| myomorph | A rodent of the suborder Myomorpha, which includes the ratlike rodents (i.e. most… | 1883 | Go To Quotation |
| myoseptum | A membrane which separates adjacent myomeres in lower vertebrates and in the embryos of higher vertebrates. | 1890 | Go To Quotation |
| myriapodal | = myriapod adj. | 1878 | Go To Quotation |
| myrmecologist | An expert in or student of myrmecology. | 1879 | Go To Quotation |
| myrmecophile | = myrmecophilous adj. rare. | 1896 | Go To Quotation |
| Mysticeti | The suborder of cetaceans comprising the baleen or whalebone whales; (with pl. concord) whales of this suborder collectively. | 1890 | Go To Quotation |
| Myxosporidia | A taxonomic group comprising the myxosporidians. With pl. concord… | 1884 | Go To Quotation |
| Myzostoma | An annelid worm of the genus Myzostoma or the class Myzostomida; (also) the genus itself. Cf. myzostomid n. adj. | 1871 | Go To Quotation |
| narcomedusa | A jellyfish of the suborder Narcomedusae; a narcomedusan. | 1904 | Go To Quotation |
| Natur-philosopher | = Naturphilosoph n. | 1885 | Go To Quotation |
| naupliar | Of or relating to a nauplius or nauplii. | 1896 | Go To Quotation |
| nectophore | In some siphonophores: a zooid which has a swimming bell but lacks a manubrium… | 1901 | Go To Quotation |
| nectostem | = nectosome n. | 1880 | Go To Quotation |
| nematognath | Belonging to the order Nematognathi (now called Siluriformes), comprising the catfishes… | 1887 | Go To Quotation |
| neocyanite | A copper silicate mineral occurring as blue platy crystals in the fumaroles of… | 1882 | Go To Quotation |
| neo-Darwinism | A theory of biological evolution (widely accepted since the 1920s) based on Darwin's… | 1891 | Go To Quotation |
| neo-Lamarckism | Any of various theories of evolution which seek to retain Lamarck's idea that… | 1887 | Go To Quotation |
| neomorphic | Of rock: altered in form after crystallization from magma. Obs. rare. | 1895 | Go To Quotation |
| neontologic | = neontological adj. | 1935 | Go To Quotation |
| neotenous | = neotenic adj. | 1920 | Go To Quotation |
| neotesite | A reddish hydrated silicate of manganese and magnesium. | 1890 | Go To Quotation |
| neotropics | The tropical and subtropical parts of the New World; spec. the neotropical… | 1925 | Go To Quotation |
| neovolcanic | Of, relating to, or designating volcanic rocks and phenomena dating from the Tertiary period… | 1887 | Go To Quotation |
| neurally | Zool. On the neural aspect of the body. | 1884 | Go To Quotation |
| neuroectoderm | Ectoderm that gives rise to neural tissue; esp. the region of ectoderm that gives rise… | 1900 | Go To Quotation |
| neuroepithelium | Anat. and Zool. Epithelium containing or consisting of sensory receptor cells. | 1878 | Go To Quotation |
| neuromast | Any of numerous small mechanoreceptive organs in fishes and in larval and… | 1885 | Go To Quotation |
| neuron-like | Resembling or behaving like a neuron or (Computing) an interconnected system of neurons. | 1907 | Go To Quotation |
| neuropterist | An entomologist who is an expert or specialist in the order Neuroptera. | 1869 | Go To Quotation |
| neurula | An embryo during the stage of development following the gastrula, when the neural plate and neural tube develop. | 1878 | Go To Quotation |
| neurulation | The processes involved in the formation of a neurula; spec. the formation of the neural tube. | 1888 | Go To Quotation |
| new mathematics | Usu. with the. A new system of or approach to mathematics; spec. a system of… | 1874 | Go To Quotation |
| new physics | Usu. with the. A branch of physics based on radically new principles or assumptions… | 1874 | Go To Quotation |
| Nile | a large crocodile, Crocodylus niloticus, with a long narrow head, widespread in Africa and Madagascar. Cf. crocodile n. 1a. | 1888 | Go To Quotation |
| nitrophile | A nitrophilous organism. | 1930 | Go To Quotation |
| nitrophobe | A nitrophobous organism. | 1930 | Go To Quotation |
| nitrophobous | Esp. of a lichen or fungus: not growing or thriving in a soil or on a substrate that is rich in nitrogen. | 1930 | Go To Quotation |
| Niue | = Niuean n. | 1885 | Go To Quotation |
| nomen nudum | A Latin name which was introduced without publication of an adequate description of… | 1881 | Go To Quotation |
| non-adaptiveness | Absence of adaptiveness; (Biol.) the fact or property of being non-adaptive. | 1916 | Go To Quotation |
| non-biological | Not belonging to biology or forming part of its subject matter. | 1882 | Go To Quotation |
| non-crossover | A chromosome that has not undergone crossing over during meiosis; a gamete that has one… | 1914 | Go To Quotation |
| non-sexually | In a non-sexual manner; (Biol.) asexually. | 1875 | Go To Quotation |
| Norian | Of, relating to, or designating a former stratigraphic division of the Archaean rocks… | 1871 | Go To Quotation |
| north–south | attrib. Following a course from north to south; having the alignment of a line of this kind (a meridian or line of longitude). | 1870 | Go To Quotation |
| Nosema | A genus of microsporidian protozoans which are parasitic mainly in insects; (also… | 1900 | Go To Quotation |
| notate | In music. | 1871 | Go To Quotation |
| notated | Set down or recorded, esp. using a formal system of notation. | 1886 | Go To Quotation |
| notostome | A dorsal opening on the midline of the skull in certain fossil armoured… | 1885 | Go To Quotation |
| nuclear fusion | Biol. The fusion of cell nuclei. | 1887 | Go To Quotation |
| nuclear plate | Cell Biol. = metaphase plate n. at metaphase n. adj. Special uses. Now rare. | 1880 | Go To Quotation |
| nucleo- | | 1887 | Go To Quotation |
| nucleohistone | Nucleoprotein in which histones form the protein component; a compound of this nature. | 1894 | Go To Quotation |
| nucleus ruber | = red nucleus n. at red adj. n. 2d(a). | 1886 | Go To Quotation |
| obsolescing | Becoming obsolete. | 1892 | Go To Quotation |
| oceanological | Of or relating to oceanology. | 1902 | Go To Quotation |
| ocellar | Zool. Of or relating to an ocellus or ocelli. | 1872 | Go To Quotation |
| octoploid | Containing eight homologous sets of chromosomes (i.e. four times the diploid complement); made up of somatic cells of this kind. | 1921 | Go To Quotation |
| octoploidy | The state or condition of being octoploid. | 1924 | Go To Quotation |
| odontogenesis | The development of teeth. | 1892 | Go To Quotation |
| olericulturally | In relation to olericulture. | 1888 | Go To Quotation |
| oligochaete | Of or relating to annelid worms of the class Oligochaeta, which includes… | 1875 | Go To Quotation |
| oligophagous | Of an insect, etc.: feeding on a limited range of plants; (also) parasitizing a limited range of hosts. | 1920 | Go To Quotation |
| olive drab | A brownish-green colour, spec. that of the U.S. Army uniform since the First World War (1914… | 1869 | Go To Quotation |
| ommatidial | Of or relating to an ommatidium. | 1887 | Go To Quotation |
| omnivore | An omnivorous animal. | 1871 | Go To Quotation |
| Ona | A member of a South American Indian people formerly inhabiting the islands of Tierra del Fuego. | 1884 | Go To Quotation |
| oncosphere | A tapeworm embryo or larva in the form in which it hatches from the egg, having a small… | 1892 | Go To Quotation |
| one-fingered | Involving the use of only one finger; simple or rudimentary; requiring or having little dexterity. | 1868 | Go To Quotation |
| ooblast | = oocyte n. | 1885 | Go To Quotation |
| oolithic | = oolitic adj. | 1895 | Go To Quotation |
| oomycete | A fungus belonging to the class Oomycetes of mainly aquatic saprobic and… | 1889 | Go To Quotation |
| ophiurid | An echinoderm of the group comprising the brittlestars, now regarded as the class Ophiuroidea; = ophiuroid n. adj. | 1869 | Go To Quotation |
| ophiuroid | A marine echinoderm of the class Ophiuroidea, related to the starfishes and having… | 1870 | Go To Quotation |
| opilionid | An arachnid of the order Opiliones (also known as Phalangida), characterized by a… | 1900 | Go To Quotation |
| opisthoglyph | = opisthoglyphous adj. | 1882 | Go To Quotation |
| opisthure | The posterior end of the caudal axis in the embryonic stage of certain fishes, which ultimately becomes part of the caudal fin. | 1885 | Go To Quotation |
| organotypic | Typical or characteristic of an organ or type of tissue; spec. (of cells or tissue… | 1918 | Go To Quotation |
| oribatid | Of or relating to the family Oribatidae or order Oribatida of small, dark… | 1880 | Go To Quotation |
| ornithophile | A lover of birds. | 1881 | Go To Quotation |
| ornithophilous | Of a plant: pollinated by birds. | 1871 | Go To Quotation |
| ornithopod | Of, relating to, or designating the suborder Ornithopoda of herbivorous… | 1886 | Go To Quotation |
| ornithopodous | = ornithopod adj. | 1886 | Go To Quotation |
| orthocephaly | The condition of being orthocephalic. | 1884 | Go To Quotation |
| orthophyre | A porphyritic rock containing phenocrysts chiefly of orthoclase in a feldspathic groundmass. | 1869 | Go To Quotation |
| orthopteroid | An orthopteran or similar insect; spec. a member of an informal assemblage of orders allied… | 1885 | Go To Quotation |
| os hyoideum | The hyoid bone. | 1869 | Go To Quotation |
| osmoregulating | That carries out or is involved in osmoregulation; that is able to osmoregulate. | 1955 | Go To Quotation |
| osteocyte | A mature bone cell, which develops from an osteoblast that has become surrounded by… | 1918 | Go To Quotation |
| otariid | An animal of the family Otariidae, which comprises carnivorous marine mammals… | 1871 | Go To Quotation |
| outcrossing | The act of performing an outcross; reproduction by unrelated individuals. | 1890 | Go To Quotation |
| outdoorsman | A man who enjoys outdoor activities; a man who spends most of his time outdoors, esp. one engaged in an outdoor occupation. | 1938 | Go To Quotation |
| outpushing | The action or process of pushing outwards; an instance of this. Also: a bulge… | 1867 | Go To Quotation |
| ovariectomized | That has undergone ovariectomy. | 1924 | Go To Quotation |
| overfur | = overhair n. Cf. underfur n. | 1896 | Go To Quotation |
| overmastering | The action of overmaster v. | 1870 | Go To Quotation |
| overmature | Having passed beyond the state of maturity; beginning to age or deteriorate. Also: more mature than the average. | 1895 | Go To Quotation |
| overplacement | The deposition of soil material or rock debris at the foot of a slope largely or wholly… | 1877 | Go To Quotation |
| ovigenesis | = oogenesis n. | 1887 | Go To Quotation |
| ovulating | The process of ovulation. Chiefly attrib. | 1891 | Go To Quotation |
| oxycephaly | The condition of having a head or skull that is abnormally high and pointed in shape; spec.… | 1885 | Go To Quotation |
| oxychromatin | Oxyphilic nuclear material; spec. a (supposed) oxyphilic form of chromatin. | 1894 | Go To Quotation |
| pachycephaly | Abnormal thickness of the skull. | 1885 | Go To Quotation |
| paedogenesis | A form of parthenogenesis involving reproduction by an organism still in the larval… | 1870 | Go To Quotation |
| pair-bonding | The formation of a pair-bond; the patterns of behaviour that establish a pair-bond. Cf. pair-formation n. at pair n. 1. | 1961 | Go To Quotation |
| palaeogeographer | An expert in or student of palaeogeography. | 1881 | Go To Quotation |
| palaeophytologist | An expert in or student of palaeophytology. | 1869 | Go To Quotation |
| palatograph | An instrument for recording contact between the tongue and the roof of the mouth in the articulation of speech sounds. | 1885 | Go To Quotation |
| palinal | Characterized by or involving backward motion, esp. of the lower jaw in chewing. Contrasted with proal. Cf. propalinal adj. | 1888 | Go To Quotation |
| pamprodactylous | Of a bird's foot: having all the toes pointing forward. | 1889 | Go To Quotation |
| panaesthetism | The theory that consciousness may be inherent in all matter. | 1882 | Go To Quotation |
| pandermite | A white mineral consisting of a hydrated borate of calcium, now regarded as identical with priceite. | 1885 | Go To Quotation |
| panmictic | Characterized by or exhibiting panmixia. | 1933 | Go To Quotation |
| papilionine | Of or relating to the subfamily Papilioninae of swallowtail butterflies. | 1884 | Go To Quotation |
| parabiosis | Entomol. and Ecol. An association between two species of ants in which they share the same nest without mingling. | 1901 | Go To Quotation |
| parabiotic | Entomol. and Ecol. Of, relating to, or exhibiting parabiosis (between ant species). | 1901 | Go To Quotation |
| paraconid | A cusp on a mammalian lower molar tooth corresponding to the paracone on an upper molar. | 1888 | Go To Quotation |
| paranucleolus | Any of various intranuclear structures associated with or resembling a nucleolus. Also… | 1887 | Go To Quotation |
| parasagittal | Taken parallel to the sagittal plane; located near the sagittal plane. | 1907 | Go To Quotation |
| parasitize | trans. (chiefly in pass.). To live on, in, or with (an organism) as a parasite; to attack… | 1872 | Go To Quotation |
| parasitology | The branch of biology and medicine concerned with parasites and parasitic diseases. | 1870 | Go To Quotation |
| paratherian | In the terminology of J. A. Ryder: of or relating to a group Paratheria of… | 1885 | Go To Quotation |
| parenchymella | A sponge larva having no internal cavity. | 1887 | Go To Quotation |
| parthenogenetically | In a parthenogenetic manner; by means of parthenogenesis. | 1874 | Go To Quotation |
| parthenogenous | = parthenogenetic adj. 1. | 1869 | Go To Quotation |
| parthenospore | A thick-walled spore resembling a zygospore but produced parthenogenetically in certain algae and fungi. | 1881 | Go To Quotation |
| parthenote | An organism produced from an unfertilized egg by parthenogenesis, esp. one which (as… | 1931 | Go To Quotation |
| pathobiologist | A person who studies pathogenic organisms. Obs. rare. | 1888 | Go To Quotation |
| patinated | Covered with a patina. Also fig. | 1893 | Go To Quotation |
| patternist | A student or interpreter of patterns; spec. an exponent or proponent of patternism. | 1873 | Go To Quotation |
| pauropod | A myriapod of the small class (formerly order) Pauropoda, resembling a minute… | 1879 | Go To Quotation |
| pegmatoid | Resembling or similar in structure to pegmatite, but usually lacking a graphic appearance; consisting of a rock of this nature. | 1889 | Go To Quotation |
| pelmatozoan | An echinoderm which is fixed to the substrate by a stalk; a member of… | 1888 | Go To Quotation |
| pelobatoid | Of, relating to, or designating anuran amphibians of a type represented by the genus Pelobates… | 1880 | Go To Quotation |
| peltogaster | A rhizocephalan cirripede of the genus Peltogaster, parasitic on hermit crabs; (in form Peltogaster) the genus itself. | 1871 | Go To Quotation |
| pelycosaur | A fossil synapsid reptile of the order Pelycosauria, known from late Carboniferous… | 1884 | Go To Quotation |
| pelycosaurian | Of, relating to, designating, or characteristic of a pelycosaur or pelycosaurs. | 1879 | Go To Quotation |
| pennatulid | A coelenterate of the family Pennatulidae; a sea pen. | 1869 | Go To Quotation |
| percomorph | Of or relating to the former order Percomorphi or the series Percomorpha, both of… | 1884 | Go To Quotation |
| pericarpal | = pericarpic adj. | 1908 | Go To Quotation |
| peridinian | A dinoflagellate of the chiefly marine order Peridinales. | 1902 | Go To Quotation |
| peripatoid | Of, relating to, or resembling animals of the phylum Onychophora; onychophoran, peripatid. | 1894 | Go To Quotation |
| periproct | In an echinoid: a small circular membranous region on the aboral surface containing the anus… | 1869 | Go To Quotation |
| perlid | A stonefly of the family Perlidae, comprising common stoneflies. | 1882 | Go To Quotation |
| perthitic | Of, relating to, or resembling perthite or its texture. | 1887 | Go To Quotation |
| petrogenesis | The formation of rocks, esp. igneous and metamorphic rocks. Also: the branch of geology concerned with this. | 1886 | Go To Quotation |
| petrogenetic | Of or relating to the origin of rocks; relating to petrogenesis. | 1868 | Go To Quotation |
| phacochoerid | A member of the (former) family Phacochoeridae of suids; a warthog. | 1873 | Go To Quotation |
| phagocytoblast | In the terminology of E. Metschnikoff: a primitive embryonic tissue comprising endoderm and mesoderm. | 1887 | Go To Quotation |
| phaneropterid | Belonging to the family Phaneropteridae of slender, long-legged bush crickets. | 1885 | Go To Quotation |
| phenotypic | Of or relating to phenotypes, or the observable features of or differences between organisms. Often contrasted with genotypic. | 1911 | Go To Quotation |
| phenotypical | = phenotypic adj. | 1911 | Go To Quotation |
| phenotypically | As regards phenotypes; from a phenotypical viewpoint. | 1911 | Go To Quotation |
| phlogistonist | A believer in the theory of phlogiston. | 1887 | Go To Quotation |
| phocid | A seal of the family Phocidae, which originally comprised the seals together with the… | 1871 | Go To Quotation |
| phorid | Of, relating to, or characteristic of the family Phoridae, comprising… | 1901 | Go To Quotation |
| photonegativity | Tendency to avoid or move away from light. | 1921 | Go To Quotation |
| phototropic | Chiefly Biol. Characterized by or exhibiting (positive or negative) phototropism… | 1883 | Go To Quotation |
| phyletically | With regard to evolutionary history and development; (also) in a phyletic manner. | 1885 | Go To Quotation |
| phyllocaridan | = phyllocarid adj. | 1882 | Go To Quotation |
| phylo- | of or relating to a proposed superorder Phyloptera of insects with incomplete… | 1883 | Go To Quotation |
| phylogenetics | The branch of biology that deals with phylogeny, esp. with the deduction of… | 1899 | Go To Quotation |
| phylogenic | = phylogenetic adj. | 1875 | Go To Quotation |
| physiographically | From a physiographical point of view; as regards physiography. | 1895 | Go To Quotation |
| phytopalaeontology | The branch of palaeontology concerned with extinct and fossil plants; palaeobotany. | 1879 | Go To Quotation |
| pierid | A butterfly of the large family Pieridae (formerly treated as the… | 1876 | Go To Quotation |
| piezo- | crystallization of a magma, usually in a distinctive or abnormal manner, under conditions of mechanical stress. | 1895 | Go To Quotation |
| piezoelectrical | = piezoelectric adj. | 1893 | Go To Quotation |
| pileum | The top of the head of a bird; = cap n. 10d. | 1872 | Go To Quotation |
| pinnation | Pinnate condition or formation; (manner of) division into pinnae. | 1873 | Go To Quotation |
| pinnoite | A yellow or yellowish-greenish mineral which is a hydrated borate of magnesium, MgB 2 O 4 ·3H… | 1885 | Go To Quotation |
| pipid | A frog of the family Pipidae, which comprises the tongueless frogs, including the African clawed frog, Xenopus laevis. | 1923 | Go To Quotation |
| piroplasma | = piroplasm n. Also (in form Piroplasma): a former genus of protozoans which includes piroplasms (now called Babesia). | 1895 | Go To Quotation |
| piton | A volcanic peak, esp. one with steep sides. | 1886 | Go To Quotation |
| planigale | Any of several small, flat-skulled, mouse-like carnivorous marsupials of… | 1936 | Go To Quotation |
| planktological | Of or relating to planktology. | 1913 | Go To Quotation |
| planktology | The branch of science that deals with plankton. | 1892 | Go To Quotation |
| planktotrophy | The state or condition of being planktotrophic. | 1973 | Go To Quotation |
| plantigrady | The state or condition of being plantigrade. | 1903 | Go To Quotation |
| planulation | The formation of a flattened embryo resembling a planula larva. Obs. rare. | 1895 | Go To Quotation |
| plasmodesma | A narrow thread of cytoplasm that passes between adjacent cells and allows communication between them. | 1905 | Go To Quotation |
| platyhelminth | A worm of the phylum Platyhelminthes, which comprises the flatworms (including… | 1877 | Go To Quotation |
| platysomid | Of, belonging to, or characteristic of the extinct family Platysomidae of… | 1878 | Go To Quotation |
| plectospondylous | = plectospondyl adj. | 1887 | Go To Quotation |
| pleromorph | A type of pseudomorph produced by the deposition of a mineral substance so as to fill… | 1887 | Go To Quotation |
| plethodontid | A lungless salamander of the family Plethodontidae. | 1922 | Go To Quotation |
| pleurite | Each of the lateral sections of the exoskeleton of an arthropod; a pleural sclerite. Cf. sternite n., tergite n. | 1867 | Go To Quotation |
| Pleurococcus | A genus of single-celled cyanobacteria (blue-green algae), many of which may be found… | 1873 | Go To Quotation |
| pleuroid | = pleurapophysis n. | 1887 | Go To Quotation |
| pleurostict | Designating or belonging to a division Pleurosticti of scarabaeid beetles characterized… | 1888 | Go To Quotation |
| pleurotomoid | Resembling or allied to the genus Turris (formerly Pleurotoma) of gastropod molluscs… | 1881 | Go To Quotation |
| pleurum | The pleuron of an arthropod. | 1876 | Go To Quotation |
| pliosaurian | Of, relating to, or designating the pliosaurs. | 1883 | Go To Quotation |
| plumbostannite | A mineral consisting of a sulphide of tin, lead, antimony, and iron, subsequently regarded as an impure form of franckeite. | 1894 | Go To Quotation |
| podurid | A springtail of the family Poduridae. | 1871 | Go To Quotation |
| polyarsenite | = sarkinite n. | 1890 | Go To Quotation |
| polychaete | Of or relating to the class Polychaeta of aquatic annelid worms (including lugworms… | 1881 | Go To Quotation |
| polychotomy | Division into more than two parts or groups; esp. (Taxon.) the division of a… | 1887 | Go To Quotation |
| polychromism | = polychromatism n. | 1903 | Go To Quotation |
| polylithionite | A mineral of the mica group that contains lithium (in a higher proportion than… | 1884 | Go To Quotation |
| polymelous | Exhibiting polymely; having supernumerary limbs. | 1901 | Go To Quotation |
| polymely | = polymelia n. | 1882 | Go To Quotation |
| polymodal | Statistics. = multimodal adj. 1. | 1910 | Go To Quotation |
| polynoid | Any of various errant polychaete worms constituting the family Polynoidae, having a… | 1889 | Go To Quotation |
| polynucleate | = polynuclear adj. 1. | 1894 | Go To Quotation |
| polyphagic | Zool. That exhibits polyphagy; = polyphagous adj. 1. | 1885 | Go To Quotation |
| polyphylesis | = polyphyly n. | 1897 | Go To Quotation |
| polyphyletism | = polyphylesis n. | 1936 | Go To Quotation |
| polyplastid | A multicellular organism. | 1884 | Go To Quotation |
| polyspermy | Penetration of an ovum by more than one sperm. | 1887 | Go To Quotation |
| polytenic | = polytene adj. | 1952 | Go To Quotation |
| pompilid | Of or relating to the hymenopteran family Pompilidae, that comprises solitary wasps… | 1898 | Go To Quotation |
| ponerine | Of or relating to the subfamily Ponerinae of ants, which includes mainly tropical species. | 1901 | Go To Quotation |
| pontinal | A small bone of the skull in fishes of the family Dactylopteridae, bridging the gap… | 1888 | Go To Quotation |
| porte-lumière | An apparatus containing a plane mirror which can be adjusted so as to reflect the sun's light in any desired direction. | 1877 | Go To Quotation |
| postclypeus | In certain insects: the upper section of a divided clypeus. | 1873 | Go To Quotation |
| posteriormost | Furthest back; nearest to the posterior. | 1906 | Go To Quotation |
| post-larval | Of, relating to, or designating a stage or stages in the development of an animal… | 1883 | Go To Quotation |
| post-selection | Selection (originally, natural selection) occurring at a later time or subsequent to another process. | 1896 | Go To Quotation |
| potamoplankton | Plankton found in rivers or streams. | 1899 | Go To Quotation |
| preaxal | In the terminology of B. G. Wilder: located anterior or superior to the axon; = prechordal adj. 1. Cf. preaxial adj. | 1887 | Go To Quotation |
| precopulatory | In an arthropod: designating a leg anterior to the copulatory legs. Obs. rare. | 1896 | Go To Quotation |
| prepupal | Designating the stage or instar of a larval insect's development immediately preceding its change into a pupa. | 1901 | Go To Quotation |
| prerima | The fissure between the hemispheres of the brain in certain lungfishes, extending anteriorly. | 1887 | Go To Quotation |
| presternal | Anat. and Zool. Of or relating to the presternum (presternum n. 2) (now rare); situated anterior or superior to the sternum. | 1885 | Go To Quotation |
| proal | Characterized by or involving movement from back to front, esp. of the lower jaw… | 1888 | Go To Quotation |
| proamnion | In many vertebrate embryos: an area of blastoderm, located at the cephalic end, in which… | 1887 | Go To Quotation |
| procerebrum | The anterior part of the central nervous system in various invertebrates; spec. the lateral… | 1884 | Go To Quotation |
| procurrent | Running forwards; continuing or tapering forward at the base; spec. (in bony… | 1884 | Go To Quotation |
| proganosaur | An extinct aquatic reptile of the former order or suborder Proganosauria; = mesosaur n. | 1900 | Go To Quotation |
| proloculus | The first chamber formed by the zygote of a foraminiferan. | 1905 | Go To Quotation |
| proofed | That has been proofed (in various senses); spec. (a) that has been rendered impervious… | 1892 | Go To Quotation |
| propalinal | Characterized by or involving forward and backward motion, esp. of the lower jaw in chewing. Cf. palinal adj., proal adj. | 1888 | Go To Quotation |
| prophylaxy | = prophylaxis n. | 1884 | Go To Quotation |
| Propliopithecus | An extinct ape-like primate of the genus Propliopithecus, known from early Oligocene… | 1910 | Go To Quotation |
| propodus | The propodite of a crustacean limb, esp. in a claw-bearing limb, where it forms the base… | 1869 | Go To Quotation |
| propus | = propodus n. | 1931 | Go To Quotation |
| proteid | A salamander of the family Proteidae, which comprises the olm of Europe (Proteus anguinus)… | 1885 | Go To Quotation |
| protistan | Of, relating to, or belonging to the kingdom Protista. | 1889 | Go To Quotation |
| protistology | The branch of biology that deals with protists. | 1903 | Go To Quotation |
| protobranch | A bivalve mollusc of the relatively primitive subclass Protobranchia, whose… | 1899 | Go To Quotation |
| protoconid | A cusp on the anterior buccal corner of a mammalian lower molar tooth. | 1888 | Go To Quotation |
| protoconule | A minor cusp between the protocone and the paracone of a mammalian upper molar tooth. | 1888 | Go To Quotation |
| protonephridium | A branched, blind-ended nephridium containing flame cells (as in flatworms and… | 1891 | Go To Quotation |
| protoplasmatic | = protoplasmic adj. 1. | 1872 | Go To Quotation |
| protopterygian | Designating the stage in the embryonic development of a bony fish during which the fin rays first appear. | 1885 | Go To Quotation |
| protospore | Mycol. Originally: an early stage in fungal spore development believed to be analogous… | 1865 | Go To Quotation |
| protostome | = protostoma n. at proto- comb._form 2a. Obs. rare. | 1884 | Go To Quotation |
| proturan | Of, relating to, or designating (insects of) the order Protura. | 1919 | Go To Quotation |
| pseudobranchial | Relating to or of the nature of a pseudobranch (pseudobranchia). | 1885 | Go To Quotation |
| pseudomorph | To produce or form (a mineral) as a pseudomorph (after an initial or starting mineral). Usu. in pass. | 1886 | Go To Quotation |
| pseudoplanktonic | Of the nature of pseudoplankton; of or relating to pseudoplankton. | 1898 | Go To Quotation |
| pseudopupa | In oil and blister beetles: a larval instar which resembles a pupa in being immobile… | 1878 | Go To Quotation |
| pseudopupal | Relating to or involving a pseudopupa. | 1878 | Go To Quotation |
| pseudostigmatic | Bot. Designating or involving a structure resembling the stigma of a flower in form or function. rare. | 1871 | Go To Quotation |
| psocid | Any of numerous small, sometimes wingless, insects constituting the order Psocoptera… | 1884 | Go To Quotation |
| psychobiology | The branch of science that deals with the biological basis of behaviour or mental… | 1879 | Go To Quotation |
| psychoid | The unconscious mind, regarded as directing bodily functions and instinctive or… | 1903 | Go To Quotation |
| pteraspid | An armoured, jawless fossil fish (ostracoderm) of the family Pteraspididae (formerly Pteraspidae… | 1884 | Go To Quotation |
| pterography | = pterylography n. | 1887 | Go To Quotation |
| Puebloan | A Pueblo Indian. | 1883 | Go To Quotation |
| pusstail | A grass of the genus Setaria; bristle grass. Also called foxtail. | 1888 | Go To Quotation |
| pyramidologist | A person who believes in the occult or religious significance of the Egyptian pyramids… | 1891 | Go To Quotation |
| pyrophanite | An oxide mineral containing manganese and titanium, typically occurring as small, deep… | 1893 | Go To Quotation |
| pyrrhoarsenite | An orange-red variety of berzeliite containing some antimony. | 1888 | Go To Quotation |
| pythonomorph | Originally: any of various large extinct marine reptiles of the… | 1869 | Go To Quotation |
| quartzine | A form of fibrous silica closely similar to chalcedony (of which it is often regarded… | 1893 | Go To Quotation |
| raciation | The evolutionary development of distinguishable biological races (race n. 5). | 1934 | Go To Quotation |
| radiale | A radial plate in an echinoderm; = radial n. 3. Usu. in pl. Now rare. | 1869 | Go To Quotation |
| Rathke | Embryol. In the genitive, and with of, esp. in Rathke's pouch. Designating a hollow… | 1885 | Go To Quotation |
| ratitate | = ratite adj. | 1879 | Go To Quotation |
| recombinational | Of or relating to recombination; formed by recombination. | 1931 | Go To Quotation |
| refringence | = refringency n. | 1896 | Go To Quotation |
| refugium | An isolated area forming a natural refuge (refuge n. 4d) for plants and animals. In later… | 1902 | Go To Quotation |
| retrusible | That can be moved or thrust backwards. | 1884 | Go To Quotation |
| rhynchophore | A beetle of the former group Rhynchophora; a weevil. | 1875 | Go To Quotation |
| riebeckite | Any of a group of amphiboles containing sodium, often with some magnesium, found as dark… | 1888 | Go To Quotation |
| rosenbuschite | A rare rock-forming mineral containing zirconium, occurring as slender orange or… | 1888 | Go To Quotation |
| schematically | In a definite pattern; according to a symmetrical plan. | 1881 | Go To Quotation |
| scolytoid | spec. A term used by C. V. Riley to denote the sixth and final larval stage of insects which undergo hypermetamorphosis. | 1883 | Go To Quotation |
| seasider | A frequenter of the seaside. (In quot. 1976 used as the nickname of an Association football team.) | 1870 | Go To Quotation |
| sexualized | Characteristic of or having a specific gender; (Biol., of an organism) capable… | 1888 | Go To Quotation |
| -some | (a) used with this sense, as in ecto- comb._form, trophosome n. at tropho- comb._form… | 1921 | Go To Quotation |
| sotol | A plant of dry regions belonging to the genus Dasylirion of the family Agavaceæ… | 1881 | Go To Quotation |
| Sporozoa | With pl. concord: a phylum of mainly parasitic spore-forming protists that have a… | 1882 | Go To Quotation |
| subtectal | A bone of the skull in certain fishes (prob. the alisphenoid). Obs. rare. | 1888 | Go To Quotation |
| superclass | Biol. A taxonomic category ranking above class and below subphylum; a group of this rank. | 1873 | Go To Quotation |
| talonid | A flattened cusp on a mammalian lower molar tooth, corresponding to the talon on an upper molar. | 1897 | Go To Quotation |
| taxeopodous | Having each one of the carpal or tarsal bones of one row articulated with one of the other row; opposed to diplarthrous. | 1887 | Go To Quotation |
| technonomy | The study of the practical application of technology and technologies and the principles which can be deduced from this. | 1882 | Go To Quotation |
| tectocephalic | = scaphocephalic adj. at scaphocephalus n. Derivatives. | 1888 | Go To Quotation |
| telmatology | That department of physiography which deals with peatbogs. | 1903 | Go To Quotation |
| tetrasome | A chromosome which is represented four times in a chromosomal complement; also, a tetrasomic individual. | 1921 | Go To Quotation |
| tetrasomic | Of or pertaining to a tetrasome. Also as n., a tetrasomic chromosome, cell, or individual. | 1922 | Go To Quotation |
| toll-bait | Chopped bait thrown into the water to ‘toll’ or attract fish; throw-bait. | 1870 | Go To Quotation |
| totipotent | Capable of developing into or generating a complete organism: said of a cell. Also… | 1904 | Go To Quotation |
| tracheole | A small or minute trachea or branch of a trachea (in insects). | 1904 | Go To Quotation |
| trigonid | The triangle of cusps of the lower molar teeth in primitive mammals. | 1897 | Go To Quotation |
| trisome | A chromosome which is represented three times in a chromosomal complement; also, a trisomic individual. | 1921 | Go To Quotation |
| trisomic | Of or pertaining to a trisome. | 1921 | Go To Quotation |
| venomo-salivary | Of or pertaining to, secreting or conveying, venomous saliva. | 1888 | Go To Quotation |
| verdin | A small grey tit with a yellow head, Auriparus flaviceps, found in south-western North America. | 1881 | Go To Quotation |
| Wisconsin | Used attrib. and absol. to designate (the time of) the fourth and final Pleistocene… | 1895 | Go To Quotation |
| Yuit | An Eskimo people of eastern Chukotka, Russia, and St. Lawrence Island, Alaska. | 1881 | Go To Quotation |
