| MD | Abbreviation of Medicinae Doctor, Doctor of Medicine. Symbol for mendelevium. (05 Mar 2000) |
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| MDMA | A centrally active phenethylamine derivative related to amphetamine and methamphetamine, with central nervous system excitant and hallucinogenic properties. Synonym: 3,4-methylenedioxymethamphetamine. (05 Mar 2000) |
| MDNCF | Abbrevia tion for monocyte derived neutrophil chemotactic factor. (05 Mar 2000) |
| MDS | Abbreviation of Master of Dental Surgery. (05 Mar 2000) |