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1. A, n. View full entry 1810
...Physics. Initial letter of acceleration. Chiefly in form a. Acceleration; acceleration vector....
2. 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, ...
3. A, n. View full entry 1896
...Chem. In form A. The element argon. disused....
4. 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)...
5. A, n. View full entry 1921
...Physics. In form Å or A. Ångström....
6. 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....
7. ADP in A, n. View full entry 1942
...adenosine diphosphate....
8. AEC in A, n. View full entry 1946
...Atomic Energy Commission, an organization set up in 1946 by the U.S. government to regulate and promote use of atomic energy....
9. AGN in A, n. View full entry 1983
...active galactic nucleus (or nuclei)....
10. AGR in A, n. View full entry 1958
...advanced gas-cooled reactor....
11. AHA in A, n. View full entry 1955
...alpha-hydroxy acid....
12. AMP in A, n. View full entry 1943
...adenosine monophosphate (adenylic acid)....
13. AMPA in A, n. View full entry 1972
...alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid, an excitatory amino acid which acts as an agonist at a particular class of glutamate receptor; freq. attrib., designating receptors of this class....
14. amu in A, n. View full entry 1954
...atomic mass unit....
15. ANF in A, n. View full entry 1983
...atrial natriuretic factor....
16. ANP in A, n. View full entry 1984
...atrial natriuretic peptide....
17. APP in A, n. View full entry 1988
...amyloid precursor protein....
18. AU in A, n. View full entry 1894
...Ångström (or Ångström's) unit; cf. sense 17....
19. AU in A, n. View full entry 1910
...astronomical unit....
20. aa, n.2 View full entry 1859
...A kind of volcanic lava with a rough, jagged surface covered with loose clinkers. Freq. attrib., esp. in aa lava. Contrasted with pahoehoe....
