machine
machine code
machine-readable
macro
mad cow disease
magma
magnesium
magnet
magnetic
magnetic field
magnetic pole
magnetism
magnetize
magnitude
mail
mailbox
mail merge
main clause
mainframe
mainland, the
mains electricity
maize
major
majority
malaria
male adjective
male noun
malignant
malleus, the
malnourished
malnutrition
malt
mammal
mammary gland
mandible
mandolin
mane
manganese
mangrove swamp
mania
manic
manic depression
manned manoeuvring unit
mantle
mantra
manure
manuscript
map projection
marasmus
marble
marijuana
marimba
marine
mark noun
mark verb
market
market economy
market forces
market garden
marketplace
market share
marking
mark-up
mark-up language
marrow
Mars
marsh
marshland
marsupial
martyr
Marxism
Marxist
masculine
mass
mastitis
mate noun
mate verb
matriarch
matriarchal
matrix
matter
maxim
maximize
MB
MD
mean adjective
mean noun
meander verb
meander noun
meander cliff
measles
measuring cylinder
Mecca
MECD
mechanic
mechanical
mechanical digestion
median
media studies
medic
medical adjective
medical noun
medication
medicinal
medicine
medicine man
meditate
medium wave
medulla oblongata
mega-
megabyte
megahertz
meiosis
melanin
melanoma
melatonin
melodic
melody
melt
meltdown
melting point
Member of Parliament
membrane
memory
meningitis
meniscus
menopause
menorah
menstrual
menstrual cycle
menstruate
menstruation
mental illness
menu
mercury
Mercury
meridian
messaging
messiah
metabolism
metabolize
metal
metalloid noun
metalloid adjective
metamorphic
metamorphosis
metaphor
meteor
meteorite
methadone
methane
metre
metric
metric system, the
mg
MHz
micro-
microbe
microbiology
microchip
microorganism
microprocessor
microscope
microwave
middle class
middle-class
middle ear
middle school
migraine
migrant
migrate
migratory
milk verb
milk noun
milk tooth
millet
milli-
milligram
millilitre
millimetre
mimicry
mineral
mineralogy
mineral salt
minim
minimize
minimum wage
mining
minister
ministry
minor adjective
minor noun
minority noun
minority adjective
minor planet
minus
minus sign
miracle
mirage
miscarriage
mission
missionary
mistral
mitochondrion
mitosis
mitral valve
mixed ability
mixed economy
mixed farming
mixed number
mixed-race
mixture
ml
mm
MMU
mobile
mobility
mock
modal auxiliary
model
modem
modern languages
modifier
modify
module
molar
mole
molecular weight
molecule
mollusc
moment
momentum
monarchy
monastery
monastic
money market
money supply
monitor
monk
monocotyledon
monoculture
monogamous
monogamy
monolingual
monologue
monomer
monopoly
monosaccharide
monosodium glutamate
monosyllabic
monounsaturated
monsoon
month
moon
morass
morphine
mosaic
mosque
moss
motherboard
Mother Superior
motor
motor neurone disease
moult
mountain
mountainous
mountain range
mountainside
mountaintop
mouse
mouse mat
mouth
mouth organ
movement
MP
MP3
MRI
MRSA
MS
MSG
Mt
mucous membrane
mudslide
muezzin
Muhammad
mulch
mullah
multicellular
multicultural
multimedia
multinational
multiple
multiple sclerosis
multiplication
multiplication sign
multiplication table
multiply
multiracial
multitasking
mumps
mural
murmur
muscle
music
musical adjective
musical noun
musical instrument
musician
Muslim
mutant
mutate
mutation
muzzle
mystic
mystical
mysticism
myth