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1. A, n. View full entry 1656
...Math. Chiefly italicized. Representing the known or invariable quantity, or the first in a series of such quantities, the others being represented by b, c, etc. Cf....
2. A, n. View full entry 1810
...Physics. Initial letter of acceleration. Chiefly in form a. Acceleration; acceleration vector....
3. A, n. View full entry 1890
...Astron. In form A. In the classification system of stellar spectra: the division comprising spectra characterized by prominent Balmer hydrogen absorption lines. Also (esp. in A-star, ...
4. A, n. View full entry 1896
...Chem. In form A. The element argon. disused....
5. A, n. View full entry 1923
...Med. Chiefly in form A. Denoting one of the principal erythrocyte antigens (agglutinogens) of the ABO blood group system, and the blood type characterized by the presence of this...
6. A, n. View full entry 1953
...Biochem. Denoting a form of double stranded nucleic acid comprising a right-handed double helix in which the base pairs form an angle of approximately seventy degrees with the helix axis; (also)...
7. A, n. View full entry 1961
...Science. In form a (without point). As prefix, in symbols of units of measurement: = atto-....
8. A, n. View full entry 1921
...Physics. In form Å or A. Ångström....
9. AB in A, n. View full entry 1927
...denoting the blood type of the ABO blood group system characterized by the presence of both the A and B erythrocyte antigens (agglutinogens); freq. attrib....
10. A chromosome in A, n. View full entry 1909
...a chromosome reckoned as the first in a classification varying from author to author (now disused);a chromosome of the set which normally occurs in all the members of a species....
11. A-mode in A, n. View full entry 1946
...a mode of operation or functioning that is first in a group of two or more; spec. the mode of operation in A-scan ultrasound imaging; freq. attrib.; cf....
12. A and E in A, n. View full entry 1966
...accident and emergency (department)....
13. ABO in A, n. View full entry 1937
...designating a system of classifying human blood based on the presence or absence of A and B antigens on red blood cells, resulting in four blood types, A, B, AB, and O....
14. ABS in A, n. View full entry 1957
...acrylonitrile butadiene styrene, a hard composite thermoplastic used to make rigid moulded products such as car bodies and cases for computers; freq. attrib....
15. A.C.C. in A, n. View full entry 1876
...anodal (or anodic) contraction, contraction of a muscle to which the anode is attached when an electrical circuit is closed; an instance of this....
16. ACL in A, n. View full entry 1957
...anterior cruciate ligament (of the knee)....
17. ACS in A, n. View full entry 1942
...antireticular cytotoxic serum....
18. ACTH in A, n. View full entry 1943
...adrenocorticotropic hormone....
19. AD in A, n. View full entry 1955
...Alzheimer's disease....
20. ADD in A, n. View full entry 1979
...attention (also attentional) deficit disorder....
