List of English prefixes

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Prefix	Meaning	Examples
a(n)-	not, without	atonality, asexuality, amoral, anarchy, anonymous
ab-	away	abduction, absolutism, ablution
acr(o)-	high, up, hill	Acropolis, acrobatics
ad-	near, at	adrenal
aden(o)-	gland	adenectomy
aer(o)-	air	aeronautics, aerodrome, aeroplane, aerodynamics
agr(o)-	relating to farming	agriculture
alt-	high	altitude
alter-	another	Alter-ego, alternate
am-	love	amorous, amateur
ambi-	around, either, encircling	ambiguity, ambidexterity, Ambisagrus
an(a)-	out of	anachronism
andr-	man	androgyny, androcentrism, android, androgen
anem-	wind	anemometer
Anglo-	English or British	Anglo-Irish relations
ante-	before	antebellum
anthropo-	relating to human beings	anthropology, anthropocentrism, anthropomorphic
ant(i)-	against	antidote, antibody, anticlockwise
aut(o)-	self	autonomy, autobiography, automobile, autopilot
bar(o)-	heaviness, heavy	barometer
bathy-	deep	Bathyscaphe, Bathysphere
be-	completely, excessively; forms transitive verbs	bemuse, bespeak, bewail
ben-	well	Benediction, benign
bi-	two	bicycle, bijection, bicameralism
bi(o)-	life	biology, biography, biopsy
bibli(o)-	relating to books	bibliophilia, bibliography
blast(o)-	bud, germination	blastocyst
brady-	slow	bradycardia
brom(o)-	stench	Bromine, bromide
bronch(o)-	relating to breathing	bronchitis
cac(o)-	bad	cacophony, cacography
cad/cas-	a fall	cadence, cascade
cardi(o)-	heart	cardiovascular, Cardiac arrest
cent-, centi-	hundred or hundredth	centenarian, centimeter, centipede
cephal(o)-	head	cephalothorax
chrom(ato)-	colour	chromatic, chromosome
chron(o)-	time	chronology, chronic, chronicle
circum-	around	circumcision, circumlocution, circumference
co-	together	cooperative, co-belligerence
colpo-	vagina	colpospasm
con-	with, together	connotation, Congress, congregation
contr-	against, opposite	contradiction, contraception, controversy
cosm(o)-		cosmology, cosmopolitan, cosmotheism
counter-	against, opposite	counterpoint, Counter-Reformation
crin(o)-	cry(shed tears)	endocrinology
cryo-	frost, icy cold	cryogenics, cryoelectronics, cryostorage
crypt(o)-	hidden	cryptography, cryptozoology
cyt(o)-	cell (originally hollow receptacle)	cytoplasm, cytology
culp-	fault	culpable, culprit
dactyl(o)-	finger, digit	dactylogram
de-	taking something away, the opposite	decentralisation, dehydration, Denazification
dec(a)-, dek(a)-	ten	decamerous, December, decimeter
deci-	one tenth	deciliter
dem(o)-	people	demographics, democracy
derm(at)-	skin	dermatology, dermatitis
di-	two, double	dichromic
di-	day	diurnal
dia-	through	diameter, diagnosis, diarrhea
didact(o)-	apt at teaching	didactic
dis-	apart, separation, reverse, opposite	dissent, discovery, disambiguation
dok, dox(o)-	view, teaching	doxology, dogma, orthodox
dynam(o)-	power, force	dynamic, dynamite, dynamo
dys-	bad, deformed, abnormal	dyspepsia, dystrophy, dysarthria
eco-	house	economy, ecology, ecosystem, ecotage
ecto-	outer, external	ectomorphic, ectoparasite
edaph(o)-	soil	edaphic
electr(o)-	relating to Electricity	electrocution, electroencephalogram
embry(o)-	embryo	embryogenesis
end(o)-, ent(o)-	inside	endoscope, endothermic, entoblast
enne(a)-	nine	enneastyle, enneagram
enter(o)-	intestine	enteritis
eo-	earliest, most primitive	eobacterium, eohippus
ep(i)-, eph-	upon, above, around	epitaxy, epicenter, ephemeral
erg(o)-	work, labour	ergonomics synergy, energy
erythr(o)-	red	erythrocite
erot(o)-	love	erotic, erotomania
ethno-	race, people	ethnology, ethnolinguistics, ethnocentrism
eu-	good	eulogy, euthanasia, eugenics, euphemism
Euro-	European	Euro-MP, Eurocentric
ex-	former	ex-wife, ex-president
exo-	outside	exoskeleton
extra-	outside, beyond, additional	extra-thin, extra-special extraordinary, extraterrestrial
flor-	relating to flowers	florist
fore-	before, in advance	foreskin, foreshadowing
geo-	earth	geography, geology
glosso-	language	glossogeny, glossogony, glossolalia
gyn-	female	gynaecology, gynoid
hemi-	half	hemimetabolous, hemisphere
hemo-	blood	hemophilia, hemophobia
heter(o)-	different	heterogenous, heterosexual
hex(a)-	six	hexapod, hexagonal, hexameter
hom(o)-	same	homogenous, homosexual
hydro-	water	hydrogen, hydry
hyper-	excessive², having more than three spatial dimensions (mathematics)	hyperactive, hyperthyroidism
hyp(o)-	below²	hypodermic, hypnosis
in-	intensively	inflammable, invaluable
in-¹	not	infallibility, illiteracy, immoral, irrelevant
inter-	between, mutual	intervention, international, internet
intra-	within	intramural, intravenous, intraocular
kilo-	thousand	kilogram, kilowatt
Litho-	Rock	lithosphere
Luso-	Portuguese	lusophone
Mac- or Mc-	"son of" (often used in last names)	McCarthy, Kirsty MacColl
macro-	large	macrobiology, macroscopic
mal-	bad	malpractice, malnutrition
maxi-	many ,most	maximal, maximum
Mc-	McDonalds-like, often derogatory	McJob, McPaper (See McWords)
mega(l)-	million, very large	megabyte, megaphone, megalopolis
meso-	middle	mesoamerica, mesoscale
meta-	after, beyond	metacarpal, metaphysics
micro-	one millionth, very small	microgram, microorganism, micronation
mid-	in the middle of	mid-term elections, Mid-Autumn Festival
milli-	thousandth	milligram, milliliter
mini-	small	miniskirt, miniseries
mis-	bad, wrong	miscarriage, misanthropy, misogyny, mistake
mon(o)-	one, single	monolith, monorail, monotony, monocle
multi-	many	multiculturalism, multilingualism
myco-	relating to fungi	mycology, mycoprotein
myri(a)-	Ten thousand	myriagon, myriad
non-	not	nonsense, non-denial denial
non-	nine	nonagon
O'-	(son) of (often used in last names)	O'Brian
oct(o)-, oct(a)-	eight	octane, octopod, octagon, October
omni-	all	omnidirectional, omnivore, omnipotent
oo- ("oo-oh")	egg, ovum	oocyte
out-	more, to a greater degree	outdo, outrun
over- (noun)	more than normal, too much	overpopulation, over-consumption, overlord
over- (verb)	to do too much, to (verb) over	overlook, overspend, oversee
pent(a)-	five	pentagon
peri(o)-	around, about, enclosing, near	perimysium, pericardium, periosteum, perinatal
phyto-	relating to plants	phytogeography, phytoplankton
post-	after	postpartum depression,postmodernism
pre-	before	prediction, preview, precedent, prenatal care
pro-	for, in favour of	pro-choice, protagonist
psycho-	mind, mental	psychology, psychosomatic
pyro-	fire, flame	pyromania
quadr-, quart-	four	quadrangle, quadruplet, quartic, quartile
quinque-	five	quinquesection,
quint(i)-	fifth, five	quintiped, quintet
re-	again, repeatedly	reduction, reflection, revolution
rect(i)-	proper, straight	rectify, rectangle
retro-	backward	retrograde, retrospective
scler(o)-	hard	scleroderma, atherosclerosis
semi-	half, partial	semi-automatic, semi-detached
sept(a)-	seven	heptachord, September
sex(i)-	six	sexivalent
Sino-	Chinese	Sino-American relations
spasm(o)-	spasm	spasmatic, spasmolysis
sperm-	seed	spermophile, spermine
spher(o)-	sphere, ball	spherical, atmosphere
sphygm(o)-	pulsation	sphygmomanometer, sphygmograph
splen(o)-	spleen	splenomegaly
splanchn(o)-	viscera	splanchnopathy
schiz(o)-, schist(o)-	split	schizophrenia, schistocyte
staphyl(o)-	cluster, uvula	staphylococcus, staphyloplasty
stom(ato)-	mouth	stomatitis, stomach
styl-	pillar	stylus, stylist, stylopodium
sub-	below, less than, under,²	subset, subsonic, subway, subtitles
super-	extremely, more than,²	superhuman, Superego, supersonic
syn-	together, united, at the same time	synergy, synchronicity, synesthesia
tach(y)-	rapid, accelerated	tachycardia, tachymeter, tachyon
tel(e)-	distance, distant	telecommunications, television, telephoto lens, telodynamic
tel(o)-	end	teloblast, telophase
theo-	god	theology, theogony
trans-	across, beyond	transfer, transubstantiation, transatlantic, Trans-Siberian railway
tri-	three	triangle, tricolor, triptych
twi-	two	twilight, twig, twin
ultra-	extremely, beyond certain limit	ultramontanism, ultraviolet
un¹-	not, opposite, take something away	unconstitutional, undelete
under-	below, incompletely	underestimate, underage, undercook
uni-	one, single	uniform, unification
up-	higher	upscale, update, upgrade, upheld
ur-	first, original	urtext
ur(o)-	urine	uric, urinal
vita-	life	vitamin, vital
with-	together, united	withhold, withstand
zoo- ("zoo-oh")	relating to animals	zoomorphic, zoology

¹ Some morphemes demonstrate high allomorphy, usually completely assimilating a following consonant. Partial assimilation of voicing and/or place of articulation is also possible.

² The order from least to greatest is hypo-, sub-, super-, and hyper.

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