| Abbreviation | Definition |
|---|---|
| CIRS | Chemical Inspection and Regulation Service |
| CIS | Carbonlite Ionet Suspension |
| CIS | Chemical Information System |
| CIS | Chemical Inventory System |
| CIS | Continuous Interleaved Sampling |
| CISL | Chemical Imaging and Structures Laboratory |
| CIT | Chemical Injection for Tree |
| CITV | Chemical Injection Tree Valve |
| CIV | Chemical Injection Valve |
| CKN | Chemical Knowledge Network |
| Cl | Chlorine |
| CLA | Compressed Liquid Approximation |
| CLA | Conjugated Linoleic Acid |
| CLAP | Carbohydrates, Lipid, Nucleic Acid, Protein |
| CLC | Cholesteric Liquid Crystal |
| CLC | Cross Linked Cellulose |
| CLP | Chemistry of Life Processes |
| CLQ | Chemical Library Query |
| CLR | Calcium, Lime, and Rust remover |
| CLSEG | Confined Lateral Selective Epitaxial Growth |