- megalith
- megalithic
- megalithic tomb
- megalitre
- megalo-
- megaloblast
- megaloblastic anaemia
- megalocardia
- megalocephalic
- megalocephaly
- megalomania
- megalomaniac
- megalopolis
- megalopolitan
- megalops
- megalopsia
- megalopteran
- megalosaur
- megaparsec
- megaphanerophyte
- megaphone
- megaphyll
- megapixel
- megaplex
- megapode
- megapolis
- megaproject
- megaron
- megascopic
- megasporangium
- megaspore
- megaspore mother cell
- megasporocyte
- megasporogenesis
- megasporophyll
- megass
- megastar
- megastructure
- megathere
- megatherium
- megatherm
- megaton
- megatonnage
- megatrend
- megavitamin
- megavolt
- megawatt
- mega–
- megillah
- megilp
- meglitinide
- megohm
- megohmmeter
- megrim
- megrims
- meh
- mehitzah
- mehndi
- meibomian cyst
- meibomian gland
- meiny
- meiocyte
- meiofauna
- meionite
- meiosis
- meitnerium
- mel
- mela
- melaena
- melaleuca
- melamed
- melamine
- melamine resin
- melammed
- melan-
- melancholia
- melancholiac
- melancholic
- melancholy
- melange
- melanic
- melanin
- melanism
- melanite
- melano-
- melanoblast
- melanocyte
- melanocyte-stimulating hormone
- melanoderm
- melanoid
- melanoma
- melanophore
- melanosis
- melanosome
- melanospermous
- melanotic
- melanotropin
- melanous
- melaphyre
- melatonin
- melaxuma
- meld
- melder
- melee
- melena
- meletin
- meliaceous
- melic
- melick
- melilite
- melilot
- melinite
- melioidosis
- meliorate
- melioration
- meliorism
- meliority
- melisma
- melismatic
- melitose
- melitriose
- mell
- meller
- melliferous
- mellifluent
- mellifluous
- melliphagous
- mellite
- mellitum
- mellophone
- mellow
- mellow out
- melodeon
- melodia
- melodic
- melodic interval
- melodic minor scale
- melodics
- melodion
- melodious
- melodist
- melodize
- melodrama
- melodramatic
- melodramatize
- melody
- meloid
- melon
- melon dome
- melon foot
- melon seed
- melon-bulb
- melongene
- melos
- melt
- melt in one's mouth
- meltage
- meltdown
- meltemi
- melter
- melting point
- melting pot
- melton
- meltwater
- melty
- melungeon
- mem
- mem.
- member
- membered
- membership
- membrane
- membrane bone
- membrane transport
- membranophone
- membranous
- membranous labyrinth
- meme
- memeify
- memento
- memento mori
- memo
- memoir
- memoirist
- memoirs
- memorabilia
- memorabiliast
- memorable
- memorandum
- memorandum of understanding
- memoria technica
- memorial
- memorial park
- memorialist
- memorialize
- memoried
- memories
- memorist
- memoriter
- memorize
- memory
- memory bank
- memory card
- memory cell
- memory lane
- memory mapping
- memory span
- memory trace
- memory verse
- memory, computer
- memsahib
- men
- men's
- men's room
- men-
- men-children
- menace
- menacing
- menacme
- menad
- menadione
- menagerie
- menaquinone
- menarche
- menat
- menazon
- mend
- mend one's fences
- mend one's ways
- mendacious
- mendacity
- mendelevium
- mender
- mendicancy
- mendicant
- mendicity
- mending
- mene, mene, tekel, upharsin
- meneer
- menel
- menfolk
- menhaden
- menhir
- menial
- menilite
- meninges
- meningioma
- meningitis
- meningo-
- meningocele
- meningococcus
- meniscectomy
- meniscocytosis
- meniscus
- menispermaceous
- meno
- meno mosso
- meno-
- menology
- menopausal
- menopause
- menophania
- menopolis
- menorah
- menorrhagia
- menorrhea
- menorrhoea
- menoschesis
- menostaxis
- mens rea
- mens sana in corpore sano
- mensa
- mensal
- mensch
- mense
- menservants
- menses
- menstrual
- menstrual cycle
- menstrual extraction
- menstruate
- menstruation
- menstruous
- menstruum
- mensurable
- mensural
- mensural music
- mensural notation
- mensuration
- mensurative
- menswear
- mental
- mental age
- mental block
- mental cruelty
- mental deficiency
- mental disorder
- mental handicap
- mental healing
- mental health