| AID | acquired immunodeficiency disease; acute infectious disease; acute ionization detector; Agency for I... |
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| AIMS | abnormal involuntary movement scale; aid for the impaired medical student; arthritis impact measurem... |
| APTD | Aid to Permanently and Totally Disabled |
| BAT | basic aid training; best available technology; blunt abdominal trauma; brown adipose tissue |
| BTE | behind the ear [hearing aid]; bovine thymus extract |
| first visceral cleft | <anatomy> The cleft between the hyoid and mandibular arches of the embryo; the external auditory meatus is developed from its dorsal portion. Synonym: first visceral cleft. (05 Mar 2000) |
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