| Abbreviation | Definition |
|---|---|
| AT | acute thrombosis |
| AT | acute tonsillitis |
| AT | acyltransferase |
| AT | adenine-thymine |
| AT | adenomatoid tumour |
| AT | adoptive transfer |
| AT | aerobic training |
| AT | agglutination test |
| AT | air temperature |
| AT | air trapping |
| AT | alopecia totalis |
| AT | alternative therapy |
| AT | ambient temperature |
| AT | angiotensin |
| AT | anterior temporal |
| AT | antitrypsin |
| AT | arterial tension |
| AT | arterial thrombosis |
| AT | ataxia-telangiectasia |
| AT | atrial tachyarrhythmia |