| Abbreviation | Definition |
|---|---|
| C2H4 | Ethylene |
| C2H5OH | Ethanol |
| Ca | Calcium |
| CA | Carbon Alpha |
| CA | carbonic anhydrase (enzyme) |
| CA | Catalystic Agent |
| CA | Ceperley-Alder exchange-correlation potential |
| CA | Chemical Absorption |
| CA | Citric Acid |
| CA | Controlled Atmosphere |
| CAB | Cation-Anion Balance |
| CAB | Chemical Activity Barometer |
| CACC | Calcium Activated Chloride Channel |
| CACC | Citizens for Alternatives to Chemical Contamination |
| CACGP | Commission For Atmospheric Chemistry And Global Pollution |
| CACGP | Commission Of Atmospheric Chemistry And Global Pollution |
| CaCO3 | calcium carbonate |
| CADB | Chemical Automatics Design Bureau |
| CADET | CO2 Acid DPG Exercise and Temperature |
| CADS | Chemical Agent Detection System |