- murderousness
- maraud
- maraudery
- monorchidism
- monopyrrole
- metrocolpocele
- medfly
- moenorrhagia (a disease of women)
- morbid intumescence
- meteorism
- making rustling noise
- mournfully
- moscow
- martial arts
- MANPAD
- microtonometer
- microtia
- magneto_optic disk storage
- microcircuit
- mossback
- monophonic transmission
- monophthalmos
- monophonic
- mozartean
- MSG
- master library tape
- minor key
- mantis shrimp
- mantissa
- mantegna
- muscly
- mastotermes electromexicus
- manx
- malti
- maltese
- maltese language
- mortise_and_tenon joint
- mrna
- mesa verde national park
- mint sauce
- marinade
- mexican
- mexicali
- mexican green
- military rule
- manoeuvrer
- maneuverer
- membranous
- membrane theory
- mortality table