| MFO | medium frequency oscillator; mixed function oxidase |
|---|---|
| M-L | Martin-Lewis [medium] |
| MM | macromolecule; Maelzels metronome; major medical [insurance]; malignant melanoma; manubrium to malle... |
| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
| MRVP | mean right ventricular pressure; methyl red, Voges-Proskauer [medium] |