| C/D | cigarettes per day; cup to disc ratio |
|---|---|
| CDR | calcium-dependent regulator; clinical dementia rating; complementary determining region; computerize... |
| CFR | case-fatality ratio; citrovorum-factor rescue; Code of Federal Regulations; complement-fixation reac... |
| CMRR | common mode rejection ratio |
| CNR | cannabinoid receptor; Center for Nursing Research; contrast-to-noise ratio; Council of Nurse Researc... |