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1. 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...
2. 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....
3. 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....
4. A and E in A, n. View full entry 1966
...accident and emergency (department)....
5. 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....
6. 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....
7. ACL in A, n. View full entry 1957
...anterior cruciate ligament (of the knee)....
8. ACS in A, n. View full entry 1942
...antireticular cytotoxic serum....
9. ACTH in A, n. View full entry 1943
...adrenocorticotropic hormone....
10. AD in A, n. View full entry 1955
...Alzheimer's disease....
11. ADD in A, n. View full entry 1979
...attention (also attentional) deficit disorder....
12. ADH in A, n. View full entry 1945
...antidiuretic hormone....
13. ADHD in A, n. View full entry 1987
...attention deficit (also deficient) hyperactivity disorder....
14. AMA in A, n. View full entry 1849
...American Medical Association....
15. AMD in A, n. View full entry 1984
...age-related (also adult) macular degeneration....
16. AMS in A, n. View full entry 1969
...acute mountain sickness....
17. ANS in A, n. View full entry 1962
...autonomic (or automatic) nervous system....
18. APC in A, n. View full entry 1930
...a medicinal preparation containing aspirin, phenacetin (later replaced by paracetamol), and caffeine, used as an analgesic and antipyretic; a dose of this, typically in the form of a powder or tablet....
19. ARC in A, n. View full entry 1984
...AIDS-related complex....
20. ARV in A, n. View full entry 1994
... antiretroviral; an antiretroviral drug; antiretroviral therapy....
