| ACN | acute conditioned neurosis; Ambulatory Care Network; American College of Neuropsychiatrists; America... |
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| ACNM | American College of Nuclear Medicine; American College of Nurse-Midwives |
| ACR | abnormally contracting region; absolute catabolic rate; acriflavine; adenomatosis of colon and rectu... |
| AHA | acetohydroxamic acid; acquired hemolytic anemia; acute hemolytic anemia; American Heart Association;... |
| AHS | Academy of Health Sciences; African horse sickness; alveolar hypoventilation syndrome; American Hear... |
| llandeilo group | <geology> A series of strata in the lower Silurian formations of Great Britain; so named from Llandeilo in Southern Wales. See Chart of Geology. Source: Websters Dictionary (01 Mar 1998) |
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| ludlow group | <geology> A subdivision of the British Upper Silurian lying below the Old Red Sandstone; so named from the Ludlow, in Western England. Source: Websters Dictionary (01 Mar 1998) |
| lutheran blood-group system | A complex blood group system having pairs of alternate antigens and amorphic genes, but also subject to a dominant independently segregating repressor. (12 Dec 1998) |