- merciless
- merchant chief
- malapropos
- malayali
- male calf
- male head of the house
- malformation
- manacles
- management
- mandate
- manful ness
- mangerial
- mangle
- maniac
- mephitis
- mephitic
- marsilia quadrifolia
- marxian
- mental acumen
- mensurable
- material medica
- maternity
- melodious
- mélange
- matriarchal
- melancholy
- mechanical
- muddy
- medium term
- mucky
- medley
- much to seek
- megatrend
- meme
- megalith
- memoir
- memorandum of understanding
- memorial
- memorisation
- meet the eye
- menacing
- meet someone halfway
- messenger of peace
- messmate
- metallic voice
- metamorphosis
- measured
- meteor
- meteoric
- mb
- microfilm
- microscopic
- microsoft
- mid-day nap
- mid-on
- midden
- mazily
- matzo
- matter of record
- mat for sleeping
- much
- middle-east
- militate against
- milk food
- milk skin
- milky
- milky way
- milliard
- millibar
- mimosa pudica
- minatory
- mind one's own business
- mow someone down, mow something down
- mischance
- mischievous
- misdeed
- misdemeanour
- miserable
- misfit
- misfortune
- mishandle
- missed aim
- mission
- mould
- mottled
- misstate
- misstatement
- masterpiece
- mist
- mistress of the seas
- misunderstanding
- master
- mockery
- mocking
- mocking bird
- modelling
- motley
- modificatory
- modify
- modus operandi