| Abbreviation | Definition |
|---|---|
| CMFM | Calcium magnesium free medium |
| CMI | Chemical Measurement and Imaging |
| CMIA | Cellular and Molecular Immunology A |
| CML | Chemical Markup Language |
| CMLR | Core Mass Luminosity Relation |
| CMMAC | Chemical Molecular and Materials Analysis Centre |
| CMO | Cyclohexanone MonoOxygenase |
| CMP | Chemical Mechanical Planarization |
| CMRM | Chemical and Material Risk Management |
| CMRR | Chemistry and Metallurgy Research Replacement |
| CMS | Center for Materials Simulation |
| CMST | Chemistry and Molecular Sciences and Technologies |
| CMTK | Chloride Moisture Test Kit |
| CMWG | Chemical Metrology Working Group |
| CN | Coordination Number |
| Cn | copernicium |
| CN | Cyanide |
| CNA | Colistin Naladixic Acid |
| CNA | Columbia Naladixic Acid |
| CNC | Computer Numeric Control |