- metaphorical
- meteorologist
- method
- method demonstration
- meticulous
- mexican mint
- microbiology
- micron
- microscopically
- mid-calf
- midshipman
- midterm
- migratory
- milch
- mild
- militaristic
- military
- military job
- military service
- milk
- milk tooth
- milkman
- milksop
- millstone
- mime
- minced meat
- minefield
- mingle
- minion
- minor
- mint
- mire
- misappropriate
- misappropriation
- misconception
- miscreant
- misdate
- miser
- misinform
- mislead
- misogamist
- misogynist
- misquote
- missing
- misspent
- mistreat
- mixed blessing
- mixed blood
- mixing up
- moan
- moblog
- moderation
- modernisation
- modernity
- modest
- modifier
- modulate
- modulus
- mofussil
- moist
- moisturizer
- molasses
- mole
- molten
- monarch
- monarchic
- monition
- monochord
- monocle
- monolithic
- monorhyme
- monotype
- monovalent
- monument
- mooing of a cow
- moot
- moral turpitude
- moralize
- morbid protruberance of liver
- morbific
- more or less
- morose
- morphologist
- mortality
- mortify
- mortuary
- moulder
- mound
- mount
- mountain side
- mourn
- moustache
- mouthpiece
- moving
- mph
- much of muchness
- muck something up
- muddle
- muddle along, muddle through
- multiplication table