- melodramatic
- meningitis
- menopause
- menstruated
- mental
- mental pain
- mentality
- metallic
- mercantile community
- mercifully
- merger
- merman
- mesh
- metal pot
- mesquite
- metadata
- meteorology
- methodologist
- move
- mew
- mewl
- microbial
- microfilm
- microscopic
- microsoft
- mid-day nap
- mid-on
- midden
- messy
- messily
- mouthful
- mendacious
- middle-east
- militate against
- milk food
- milk skin
- milky
- milky way
- milliard
- millibar
- mimosa pudica
- minatory
- mind one's own business
- memorising
- minutiae
- minx
- mirthful
- misadventure
- misanthrope
- misapply
- misapprehension
- miscarry
- miscellaneous
- miscellany
- mischance
- mischievous
- misdeed
- misdemeanour
- miserable
- misfit
- misfortune
- mishandle
- missed aim
- mission
- misstate
- misstatement
- memorised
- mist
- mistress of the seas
- misunderstanding
- memorialise
- mitochondria
- mix something up
- mouldy
- mixed up in
- mixture
- mixy-maxy
- memorandum
- memorable
- mob
- mobile
- memento
- molecular biology
- moleskin
- molest
- mollusc
- molluscum contagiosum
- molotov cocktail
- moment
- monandry
- measured
- monocot
- monodrama
- monogamist
- monopolist
- monosyllable
- monotheistic
- monotone
- monotonous
- mont blanc