| bid | twice a day [Lat. bis in die] |
|---|---|
| C/D | cigarettes per day; cup to disc ratio |
| c/d | cigarettes per day |
| CDT | carbohydrate-deficient transferrin; carbon dioxide therapy; Certified Dental Technician; children's ... |
| CPPD | calcium pyrophosphate dihydrate deposition [syndrome]; cisplatin; cost per patient day |