- microprocessor
- miasmic, miasmal
- miasmatic
- misgive
- mononymous
- metathesis
- metastasize
- metallic
- metal pot
- metadata
- messy
- messily
- make fun of
- mesentery
- merlin
- merino
- merge
- meretricious
- mercy
- merciless
- merchant chief
- mephitis
- mephitic
- mental acumen
- mensurable
- mendacious
- make good
- memorising
- memorised
- maceration
- memorialise
- memorandum
- memorable
- mango peel
- memento
- melodious
- meet someone halfway
- mélange
- melancholy
- megatrend
- megalith
- meet the eye
- make hay while the sun shines
- memorabilia
- meet someone halfway
- meet
- muralant
- move heaven and earth
- meek
- maledictory
- medom
- meditative
- medicaid
- mediation
- meddlesome
- mechanistic
- measured
- mb
- mazily
- matzo
- matter of record
- matter
- matchmaker
- matching-gun
- match-stick
- match up to
- mat for sleeping
- masterpiece
- master
- massive
- mass media
- mass
- mason's rule
- mathophobia
- martyr
- martin
- metachysis
- marshal
- maldives
- marsh
- marrow
- maser
- marr
- marquis
- machiavellian
- maim
- market rate
- make as if, make as though
- market
- make it
- maladministration
- male
- malignant
- manacle
- manager
- matriculation
- manful
- manuscript
- marinate
- margin