| ACOS | American College of Osteopathic Surgeons; associate chief of staff |
|---|---|
| ACOS/AC | associate chief of staff for ambulatory care |
| COS | cheiro-oral syndrome; chief of staff; Clinical Orthopaedic Society; clinically observed seizures |
| CS | calf serum; campomelic syndrome; carcinoid syndrome; cardiogenic shock; caries-susceptible; carotid ... |
| HS | Haber syndrome; half strength; hamstring; hand surgery; Hartmann solution; head sling; healthy subje... |