| AComA | anterior communicating artery |
|---|---|
| ACOMS | American College of Oral and Maxillofacial Surgeons |
| ACOOG | American College of Osteopathic Obstetricians and Gynecologists |
| ACOP | American College of Osteopathic Pediatricians; approved code of practice |
| ACORDE | A Corsortium on Restorative Dentistry Education |
| ACOS | American College of Osteopathic Surgeons; associate chief of staff |
| ACOS/AC | associate chief of staff for ambulatory care |
| Acous | acoustics, acoustic |