- Macacus... to Macrogyria...
- Macrohydrocephalus... to Majocchi...
- Major... to Malherbe...
- Malibu... to Mammitis...
- Mammographic... to Marchand...
- Marchesani... to Martin...
- Martin... to Maternal...
- Maternity... to Median...
- Mediastinal... to Megalerythema...
- Megalia... to Melalgia...
- Melancholia... to Melitensis...
- Melitococcosis... to Meningiomatosis...
- Meningism... to Menometrorrhagia...
- Menopause... to Mesaortitis...
- Mesarteritis... to Metastasis...
- Metatarsalgia... to Michotte...
- Micrencephalon... to Micrognathia...
- Microgyria... to Miescher...
- Mieten... to Mills...
- Millstone... to Misuse...
- Mitchell... to Mollities...
- Molluscum... to Mononucleosis...
- Monoplegia... to Morphea...
- Morphine... to Mouse...
- Mouth... to Mulberry...
- Mullerian... to Myà...
- Myalgia... to Myeloencephalitis...
- Myelofibrosis... to Myesthenia...
- Myiasis... to Myoglobulinuria...
- Myopathy... to Myxosarcoma...