- Macacus... to Macrogyria...
- Macrohydrocephalus... to Majocchi...
- Major... to Malherbe...
- Malibu... to Mammillitis...
- Mammitis... to March...
- Marchand... to Marshall...
- Martin... to Masturbation...
- Maternal... to Meconium...
- Median... to Megalencephaly...
- Megalerythema... to Meige...
- Melalgia... to Melioidosis...
- Melitensis... to Meninges...
- Meningioma... to Menkes...
- Menolipsis... to Merycism...
- Merzbacher... to Metamorphopsia...
- Metaplasia... to Mibelli...
- Mice... to Microgenitalia...
- Microglioma... to Micturition...
- Middle... to Miller...
- Miller... to Mismanagement...
- Misplaced... to Mold...
- Molding... to Monocytosis...
- Monofixation... to Morgagni...
- Morgagni... to Mouchet...
- Mould... to Mucormycosis...
- Mucosa... to Muscae...
- Muscle... to Myelo...
- Myeloblastic... to Myelophthisis...
- Myeloproliferative... to Myoepithelioma...
- Myofascitis... to Myospasia...
- Myopathy... to Myxosarcoma...