Prefix List - 2025

This list includes the most common prefixes (a word element that only used as a prefix) and combining forms. Please note that prefixes can be used by itself (prefix), with space (prefix ), or with hyphen (prefix-). For example, prefix of "non" can be added to word significant as:

• nonsignificant|significant
• non-significant|significant
• non significant|significant

The following tables list all prefixes for Lexical Tools derivations:

	Prefix	Class	Sense	Negation	Example	Precision	Instances	Occurrences	Exceptions	Status
1	Afro	O	relating to Africa	O	Afro-American	57.14%	21	12	9	2012
2	Anglo	O	relating to England	O	Anglo-Irish	51.52%	33	17	16	2012
3	Euro	O	European	O	Eurocentric	35.29%	17	6	11	2012
4	Franco	O	French, France	O	Francophile	0.00%	6	0	6	2012
5	Indo	O	relating to the Indian subcontinent	O	Indo-European	52.38%	21	11	10	2012
6	a	B	lacking in, lack of, not, without	N	asexual, asymmetric	26.23%	1365	358	1007	2012
			verb > predicative adjective with progressive aspect	O	afloat, atremble
			on, in, at	O	abed, amidst, ashore
			in (such) a state or condition	O	afresh
			in (such) a manner	O	aloud, alive
7	abs	O	away, from	O	abstract	0.00%	15	0	15	2014
8	af	O	addition or increase	O	affirm	4.11%	73	3	70	2014
9	allo	O	other, different	O	alloimmunity, allosome	53.31%	287	153	134	2020
10	ambi	O	both	O	ambitendency	46.67%	30	14	16	2012
11	amphi	O	two, both, on both sides	O	amphiaster, amphitheater, amphibian	59.52%	42	25	17	2012
12	an	B	lacking in, lack of, not, without	N	anemic	34.74%	308	107	201	2012
			up, against	O	anode
13	ana	O	up, against	O	anatoxin	15.74%	108	17	91	2012
14	ante	O	before	O	antenatal	55.22%	67	37	30	2012
15	anti	N	opposite, against	N	anti-war, antivirus, anti-human	73.93%	7058	5218	1840	2012
16	apo	O	away, different from	O	apomorphine	58.67%	196	115	81	2012
			detached, separate	O	apocarpous
			formed from, related to	O	apocodeine
17	arch	O	supreme, highest, worst	O	archangel	15.91%	44	7	37	2012
			preeminent, extreme	O	archcapitalist, archinfamy
			first in time, primitive	O	archfather, archform
18	astro	O	star	O	astrobiology	41.30%	46	19	27	2012
			astrological, astrological and	O	astrodiagnosis, astromedical
			aster in cells	O	astrosphere
19	at	O	change into, movememnt to, addition or increase	O	attend	3.53%	85	3	82	2014
20	auto	O	self	O	autobiography, automatic	43.03%	839	361	478	2013
			automatic, self-acting, self-regulating	O	autofeed, autowind
			of, by, affecting or for the same individual	O	autohemagglutination, autovaccine
			self-caused, self-induced	O	autointoxication
			acting as an antibody on or produced as an antibody for one’s own antigens	O	autoagglutinin, autohemolysin
21	be	O	equipped with, covered with, beset with (pejorative or facetious)	O	bedeviled, becalm, bedazzle, bewitch	19.55%	220	43	177	2012
			to a great degree, thoroughly	O	becudgel, befuddle, bespatter
			about, to, at, upon, against; intransitive verbs from intransitive verbs	O	bestride, bespeak
			make, cause to be, treat as; verbs from adjectives or nouns	O	belittle, benumb, befriend
			chemical prefix of unknown meaning	O	bekanamycin, bemethyl
22	bi	O	two	O	bicycle	43.79%	918	402	516	2012
23	bio	O	biological	O	biodegrade	47.88%	1132	542	590	2012
24	bis	O	both; of or belonging to both; two	O	bisischiatic, bismarine	71.56%	109	78	31	2014
			doubled	O	bisdimethylamino, bisquaternary
25	cardio	O	heart; cardiac; heart action	O	cardiokymography	57.65%	340	196	144	2015
26	circum	O	around	O	circumnavigate	58.40%	125	73	52	2012
27	cis	O	on this side	O	cis-vaccenate	73.91%	46	34	12	2014
28	co	O	joint, with, accompanying	O	co-worker, coordinator, cooperation, cohabit	35.94%	1405	505	900	2012
			in or to the same degree	O	coextensive, coeval
			operating together or reciprocally	O	coterm
			of the complement of an angle	O	cosine, codeclination
29	col	O	together or with	O	colleague	8.14%	86	7	79	2012
			colon	O	colectasia
30	com	O	together or with	O	commingle	2.58%	194	5	189	2012
31	con	O	together or with	O	confederation	11.88%	446	53	393	2012
			cone	O	conus
32	contra	N	opposite	N	contradict	37.50%	88	33	55	2012
33	contro	N	opposite	N	contralateral, contravert	25.00%	8	2	6	2022
34	cor	O	together or with	O	correlation	6.09%	115	7	108	2012
35	counter	N	against, in opposition to	N	counteract, counterpart	54.44%	428	233	195	2012
36	cryo	O	ice	O	cryogenics	50.74%	337	171	166	2012
37	crypto	O	hidden, secret	O	cryptography	62.50%	64	40	24	2012
38	de	B	reverse action, get rid of, removed, without	N	de-emphasise	33.27%	2020	672	1348	2012
			down	O	depress
			get off of (something)	O	detrain, deplane
			derived or compounded from (something)	O	deacetyl
			having removal of one or more atoms of (a specified element)	O	dehydro-, deoxy-
39	demi	O	half	O	demiembryo, demispan	64.71%	17	11	6	2012
40	demo	O	people	O	demography	0.00%	19	0	19	2012
41	deoxy	O	less oxygen	O	deoxyribonucleic, deoxycholic	33.21%	271	90	181	2022
42	di	O	two	O	dioxide	70.27%	1729	1215	514	2012
43	dif	O	apart	O	differ	5.00%	20	1	19	2014
44	dis	N	not, opposite of	N	disloyal, disagree	31.49%	794	250	544	2014
			reverse action, get rid of	N	disconnect, disinformation
			apart	N	dissect
45	down	O	to make something lesser, lower or worse	O	downgrade	47.13%	244	115	129	2016
46	du	O	two	O	duet	1.54%	65	1	64	2013
47	duo	O	two	O	duovirus	53.85%	13	7	6	2013
48	dys	B	abnormal, diseased, bad, unfavorable,faulty	N	dysplasia, dyspathy, dysfunction	62.79%	258	162	96	2012
			difficult, with difficulty	O	dysmenorrhea, dysoxidize
			absence or reverse of	O	dysteleology
49	eco	O	ecological	O	ecosystem	38.46%	91	35	56	2013
50	electro	O	electric, electricity	O	electroablation	50.38%	782	394	388	2013
			electromagnetic	O	electrochronograph
			electron-related	O	electrophilic
51	em	O	to make into, to put into, to get into	O	empower	19.57%	92	18	74	2013
			to provide with	O	empower
			to cause to be (sometimes with suffix –en)	O	embolden
			so as to cover or surround; thoroughly	O	embower
52	en	O	to make into, to put into, to get into	O	enmesh	28.49%	365	104	261	2013
			in, within, inside	O	endermic, enzootic
			chemically saturated; having one double bond	O	enamine
53	epi	O	upon, at, close upon, in addition	O	epidermis	47.01%	385	181	204	2013
			petrographically altered	O	epidiorite
			epimer of a specified chemical compound	O	epicholesterol, epirhamnose
			chemical compound or group distinguished from another by having a bridge connection	O	epichlorhydrin
54	ex	O	former	O	ex-wife	14.92%	362	54	308	2013
			out of	O	export
55	extra	O	outside	O	extracurricular	68.37%	1489	1018	471	2013
56	fore	O	before	O	forearm, forerunner	40.86%	186	76	110	2013
			at or toward the front; the front part of something	O	forearm
57	geo	O	relating to the earth or its surface	O	geography	50.38%	133	67	66	2013
58	gyro	O	spinning on an axis	O	gyrokinetic	33.33%	15	5	10	2013
			in a ring or spiral	O	gyromancy
59	haem	O	blood	O	haemagglutinin	33.33%	69	23	46	2014
60	haemo	O	blood	O	haemodialysis	47.32%	224	106	118	2014
61	hem	O	blood	O	hemagglutinin	20.25%	79	16	63	2014
			blood	O	hemagglutinin
			blood	O	hemagglutinin
62	hemi	O	half	O	hemiataxia	57.91%	449	260	189	2013
63	hemo	O	blood	O	hemodialysis	47.37%	228	108	120	2014
64	hetero	O	different	O	heterosexual	50.79%	380	193	187	2013
			isomeric with or closely related to a (specified) compound	O	heteroxanthine
65	homo	O	same	O	homogenous, homologous	54.05%	346	187	159	2013
			homologous with a (specified) organic compound	O	homoserine
			from the same species; corresponding in type of structure	O	homograft, homolysin
66	hydro	O	relating to water, or using water	O	hydroelectricity	58.00%	350	203	147	2013
			containing hydrogen	O	hydroborate
			characterized by an accumulation of fluid in a (specified) body part	O	hydronephrosis
			hydroid	O	hydromedusa
67	hyper	O	above, over	O	hyperthermia	55.63%	1350	751	599	2013
68	hypo	O	under or below something, low	O	hypothermia	58.91%	713	420	293	2014
69	ideo	O	image, idea	O	ideograph	35.71%	28	10	18	2014
70	idio	O	individual, personal, unique	O	idiographic	34.69%	49	17	32	2014
71	il	N	not, opposite of	N	illegal	27.78%	54	15	39	2014
72	im	N	not, opposite of	N	immature	21.31%	413	88	325	2014
73	in	B	in, into	O	insert	33.46%	1871	626	1245	2014
			not, opposite of	N	inexact
74	infra	O	below, beneath	O	infrared	64.53%	516	333	183	2014
75	inter	O	among, between	O	intercede, interstate, interact	64.98%	4255	2765	1490	2012
76	intra	O	inside, within	O	intravenous	65.62%	3662	2403	1259	2012
77	ir	N	not, opposite of	N	irregular	30.52%	154	47	107	2014
78	iso	O	equal	O	isochromatic	73.28%	827	606	221	2014
79	macro	O	long	O	macrobiotic	56.56%	343	194	149	2014
80	mal	O	bad(ly)	O	malfunction	30.29%	175	53	122	2014
81	maxi	O	very long, very large	O	maxi-circle	25.00%	16	4	12	2014
82	mega	O	great, large	O	megabase	62.50%	160	100	60	2014
83	megalo	O	great, large	O	megastar, megalopolis	61.29%	31	19	12	2014
84	meta	O	after, along with, beyond, among, behind	O	meta-theory	58.79%	643	378	265	2014
85	micro	O	small	O	microautoradiogram	50.86%	2157	1097	1060	2014
86	mid	O	middle	O	midlife	51.03%	874	446	428	2014
87	midi	O	medium-sized	O	midiplasmin	100.00%	2	2	0	2014
88	mini	O	small	O	minibus	58.70%	230	135	95	2014
89	mis	N	wrong, astray	N	misinformation, misguide	48.60%	570	277	293	2014
90	mono	O	sole, only	O	monogamy	61.38%	857	526	331	2014
91	moto	O	movement	O	motoneuron	20.83%	24	5	19	2015
92	multi	O	many	O	multi-storey	56.92%	4120	2345	1775	2012
			many times over; in many respects	O	multimillionaire, multispecialist
			affecting many parts	O	multiglandular
93	neo	O	new	O	neolithic	52.71%	406	214	192	2014
94	non	N	not	N	nonexistent	75.15%	17604	13230	4374	2012
95	ob	O	blocking, against, concealing	O	ibstruct	3.77%	53	2	51	2014
96	oc	O	blocking, against, concealing	O	occult	0.00%	30	0	30	2014
97	of	O	blocking, against, concealing	O	offend	0.00%	7	0	7	2014
98	omni	O	all	O	omnipotent, omnipresent	44.00%	25	11	14	2012
99	op	O	blocking, against, concealing	O	oppose	1.92%	52	1	51	2014
100	ortho	O	correcting or straightening	O	orthodontics, orthotropic	67.18%	195	131	64	2012
			indicates a 1,2-substituted benzene ring in organice chemistry	O	orthonitrophenol
			indicates the common form of an acid in inorganic chemistry	O	orthoboric acid
			chemical prefix	O	orthoformate
101	out	O	better, faster, longer, beyond	O	outreach, outcome	20.61%	359	74	285	2012
102	over	O	too much	O	overreact, overact	47.83%	1522	728	794	2012
103	oxy	O	relating to oxygen	O	oxynitrate, oxyconformity	64.97%	177	115	62	2022
			sharp, pointed	O	oxyhyperglycemia, oxyesthesia
104	paed	O	child	O	paedogenetic	0.00%	2	0	2	2014
105	paedo	O	child	O	paedogenetic	77.78%	9	7	2	2014
106	paid	O	child	O	NONE	�%	0	0	0	2013
107	paido	O	child	O	NONE	�%	0	0	0	2013
108	paleo	O	old	O	paleolithic	47.76%	67	32	35	2012
109	pan	O	all, worldwide	O	pan-African	51.75%	315	163	152	2012
110	para	O	beside, beyond	O	parallel	63.30%	1000	633	367	2012
			isomeric with, polymeric with, or otherwise closely related to	O	paracasein
			the relation of two opposite positions in the benzene ring that are separated by two carbon atoms	O	parasymphysial
			a derivative in which two substituting groups occupy such positions	O	para-xylene
111	ped	O	foot	O	pedestrian	6.25%	16	1	15	2012
			creature or object having feet or footlike projections	O	Pediastrum, pedrail
			something (specified) involving feet	O	pedomotor
			child	O	pedogenetic
112	pedo	O	child	O	pedogenetic	30.43%	23	7	16	2014
113	per	O	through, completely, wrongly, exceedingly	O	permeate, permute	28.96%	297	86	211	2012
			in chemistry, to denote a large amount or designate combination of an element in its highest valence	O	perchloroethylene
114	peri	O	around	O	periabdominal	71.66%	1969	1411	558	2012
			near	O	perihelion
			enclosing, surrounding	O	perineurium
			tissue surrounding (specified part)	O	periarthritis
115	photo	O	light, photography, photograph	O	photoelectric	66.56%	978	651	327	2012
116	pod	O	foot	O	podiatrist	0.00%	16	0	16	2012
117	poly	O	many	O	polygon	65.12%	1058	689	369	2012
			chemistry--containing more than one and especially more than two or three units of (a specified substance)	O	polyatomic
			chemistry--polymer of, polymerized	O	polyethylene
			chemistry--isopoly-	O	polymolybdate
118	post	O	after	O	post-election, post-graduation, postpone	79.39%	9804	7783	2021	2012
119	pre	O	before	O	pre-election, pre-enter, predict	73.45%	10098	7417	2681	2012
120	preter	O	beyond, past, more than	O	preternatural	9.09%	11	1	10	2012
121	pro	O	for, on the side of	O	pro-life	40.60%	1096	445	651	2013
			substitute, deputy	O	proconsul
			before	O	procambium
122	pros	O	toward	O	Prosthesis	15.00%	20	3	17	2012
123	proto	O	first, original	O	protoplasm, prototype	57.23%	173	99	74	2012
124	pseudo	O	false, imitation	O	pseudonym	62.41%	3517	2195	1322	2012
125	pyr	O	fire	O	pyroantimonate	17.24%	29	5	24	2014
			in chemistry, indicates a dimeric acid anhydride	O	pyrophosphoric acid
			due to or or attributed to the action of fire or heat	O	pyrochlore
			of fiery color	O	pyrophanite
			fever, fever producing	O	pyrotoxin
126	pyro	O	fire	O	pyroantimonate	52.55%	137	72	65	2012
			in chemistry, indicates a dimeric acid anhydride	O	pyrophosphoric acid
			due to or or attributed to the action of fire or heat	O	pyrochlore
			of fiery color	O	pyrophanite
			fever, fever producing	O	pyrotoxin
127	quasi	O	partly, almost, appearing to be but not really	O	quasiaxial	61.16%	345	211	134	2012
128	re	O	again, back	O	rerun	36.64%	4645	1702	2943	2012
129	retro	O	backwards	O	retrograde	50.26%	382	192	190	2014
130	self	O	self	O	self-sufficient	47.92%	866	415	451	2014
131	semi	O	half	O	semicircle	51.61%	965	498	467	2014
132	socio	O	society, social, sociological	O	sociopath	48.86%	219	107	112	2014
133	step	O	family relation by remarriage	O	stepbrother	11.26%	151	17	134	2014
134	sub	O	below, under	O	subway	62.38%	4423	2759	1664	2012
135	sup	O	below, under	O	support	1.67%	60	1	59	2014
136	super	O	above, over	O	supervisor	48.38%	1604	776	828	2014
137	supra	O	above, over	O	suprarenal	61.63%	1105	681	424	2014
138	sur	O	above, over	O	surreal, surrender	12.50%	96	12	84	2014
139	sy	O	together, with	O	system	0.00%	38	0	38	2014
140	syl	O	together, with	O	syllable	0.00%	7	0	7	2014
141	sym	O	together, with	O	symbol	16.07%	56	9	47	2014
142	syn	O	together, with	O	synthesis	24.68%	154	38	116	2014
143	tele	O	at a distance	O	television	50.00%	494	247	247	2014
144	trans	O	across, from one place to another	O	transatlantic, transverse	49.54%	1191	590	601	2014
145	tri	O	three	O	tricycle	60.02%	908	545	363	2014
146	twi	O	two	O	twilight	3.23%	31	1	30	2014
147	ultra	O	beyond, extremely	O	ultraviolet, ultrasonic	41.34%	762	315	447	2014
148	un	N	not, opposite of	N	unnecessary, unequal	59.38%	2868	1703	1165	2012
			reverse action, deprive of, release from	N	undo, untie
149	under	B	lower in grade/dignity, lesser, insufficient	N	underachieve	45.13%	749	338	411	2014
			below, beneath	O	underground, underpass
150	uni	O	one	O	unicycle	41.07%	319	131	188	2014
151	up	O	to make something more, higher or better	O	upgrade	25.53%	329	84	245	2016
152	vice	O	deputy	O	vice-president	70.59%	17	12	5	2014
153	with	O	against	O	withstand	17.86%	28	5	23	2014