| Abbreviation | Definition |
|---|---|
| MCL | Maximum Constituent Levels |
| MCL | Maximum Critical Leakage |
| MCLFA | Medium-Chain Length Fatty Acids |
| MCP-1 | Monocyte Chemoattractant Protein-1 |
| mCPBA | meta-Chloroperoxybenzoic Acid |
| MCPP | MethylChloroPhenoxyPropionic acid |
| MCR | Magic Carpet Ride |
| MCR | Multi-Component Reactions |
| MCR | My Chemical Romance's |
| MCRB | Moving Chemical Reaction Boundary |
| MCSS | Multiple Chemical Sensitivity Syndrome |
| MCT | Medium Chained Triglycerides |
| MCT | MonoChlorTriazinyl |
| MCU | My Chemical Uomance |
| MCVD | Ment Chemical Vapor Deposition |
| MCVD | Modified Chemical Vapor Deposition |
| MCVD | Modified Chemical Vapour Deposition |
| MCWG | Marine Chemistry Working Group |
| MD | Mega-Dalton |
| Md | Mendelevium |