prefix meaning example
a-(an-) 1、on,in,at
(常只做表语)
abreast, abroad, adrift, afoot, abed, ablaze, above
2、无,非 asexual, asymmetry, amoral
ab-(abs-) 脱离、离开 abstract,  abduct, aberrant, abnormal, abolish, abort abrade, abrogate, abrupt abdicate, abnegate, abandon, abstain, abuse absent absolve absorb
aceto-(acet-) (化)醋酸的 acetic, acetonitrile
ad- 到…,表动向、方向、缩小、变化、附加、增加 advance, adverse, adjoin, adjourn, admix, adduct, adhere, adsum
aer-(aero-) 空气的、空中的,飞机用的 aerial, aeronaut, aerate, aerodrome
afore- 在前,以前 aforementioned, aforesaid, aforecited
amph-(amphi-) 两种,两侧,两者,周围 amphibian, amphimixis
ana- 在上方,后,逆转,再 anadromous, anamnesis, analogy
ante- 在前,以前 antecedent, antedate, antechamber, antemeridiem, antenatal, anterior, anteroom
anti-(ant-) 反对,叛逆,对抗,(美术、文学等)反传统式样 antipathy, antibody, antipope, anti-novel
arch- 首位的、最高的、主要的、非常的、最初 archbishop, arch-ememy, archaic, archaeology
auto-(aut-) 本身的、独自的 autobiography, automate
be- 1、—vt,全面、完全、过度 besmear, belabour
2、—vi→vt, bemoan, bestride
3、除去 behead, bereave
4、—adj or N,做…、使…、 befool, befoul, beware
5、-N,"以…围绕,给与… becloud, befriend
bi- 二次的、双重的、二个的 bifid, bifurcate, bigramy, bipartite
bio- 生命的,生物学的 biography, biological
cata-(cat-,cath-) 向下的、相反的、反对的、错误的 catadromous, catachresis, catacomb
cent-(centi-) 100、1/100 centimetre, centenary, centigrade, centigram
circum- 环绕于,在四周 circumambient, circumambulate
co- 共同、共通、相互、余、补 cooperate, cobelligerent, coincide, correspond
com-(con-) 和…共同 combination, concurrent, collaborate
contra- 逆、反 contradict, contraband, contraceptive, contractile, contradistinguish, contrariety, contrariwise
counter- 对抗、报复、敌对、匹敌 counter-current, counteract, counterattack, counterbalance, counterblast, countercharge, counterfeit, counterfoil
de- 下降、分离、彻底、除去 descend, deduct, denude, dehorn, demerit
deca- 十倍 decade, decagram, decametre
deci- 十分之一 decimal
demi- 一半 demi-mondaine
di- 二的、二次的、二倍的 dioxide, diarchy, dicephalous, diatomic
dia- 通过、完全的、分离、穿越 diameter, diabolic, diacritical
diplo- 二重的、双、复 diplococcus, dipolar
dis- 1、分离、除去 distinguish, dispose
2、否定、反对 dishonest, disabuse, disability, disable
3、(强调否定)完全 disannul, disembowel
dys- 恶性、不良 dysgenic, dyslogistic, dyspepsia, dystrophy
en-(em-) 1、置于名词前,置于…之中 engulf, embed, encage, encase, encircle
en-(em-) 2、置于名词或形容词前,使成 ensalve, enable, enact, encamp, encash
en-(em-) 3、置于动词前,在之中 endocarp, enchant
equi- 相等 equidistant, equilibrate, equipoise, equipollent, equiponderate
eu- 良好 eulogy, eugenic, eulogize, eupeptic, euphony, eurhythmic, euthanasia
ex- 1、动词字首,由…出来、完全地 exit, excruciate, 
2、形容词字首,无…、失去… exsanguine, exclude
3、名词字首,从前的 ex-president
extra- …之外的、范围外的 extraneous, extrajudicial, extramarital, extramundane, extramural
fore- 之前,在前、事前、预先的、先前的 foreshorten, foreordain, forefather
hemi- 一半 hemicycle, hemisphere
homo- 同一 homocentric, homogeneous, homologize, homologate, homologous
hydro- 水的、水肿的、氢的 hydrodynamic, hydroelectric
hyper- 在…之上、超越的、非常的、过度的 hypertension, hypersonic, hyperphysical
hypo- 在…之下,以下的,少许的(化)次 hypodermic, hypogastrium, hypogeal
il- 无、不(字首为L的词前) illegal, illegible, illegitimate
im- 无、不(字首为b,p,m的词前) imbalance, immaterial, impassable
in- in,on,into,
towards,against
incorporated, include
in- 无、不 inaccurate, inaccessible, inactive
inter- 在…之中,在…之间,表相互关系 interact, interchange
ir- 无、不(字首为R的词前) irregular, irrelative
macro 大的 macrocosm, macrocephalic
mega-(meg-) 巨大的,100万倍的、兆 megacycle, megacephalic, megalith, megaphone, megaton, megawatt
micro- 小的、1/100万、 microampere, microfarad
milli- 千分之一 milligramme
mini- 非常小的,小型的、小规模的 minibus, miniature, minimal, minimize, minimum
mis- 1、错误的(地),差错地(地) misalliance, misapply, misapprehend
2、坏的(地),恶意的(地) misbehave, mischance, mischief
3、不利地 misadventure
mono- 单独的,单一的 monoculture, monochrome, monogamy, monologue, monopolize
multi- 大量的,多数的 multicolor, multifarious, multiformity, multilateral, multiply
non- 与名词、形容词连用:不、非、无 non-logical, nonage, nonchalant
on- 与动词连用形成名词、形容词 onset .oncoming, ongoing
out- 外面的、分离的、在…之外的、过度的、以便胜过 outline, outhouse, out-door, outgrow, outrun
over- 在上、越过、上面的、外面的、超越、过度的 overhang, overcoat, overpower, overwork
pan- 全部 pan-African, pandemic, panoply
para- 侧面、超越、错误、不规则 parabola, paradise, paradox
per- 完全、非常、直接破坏为止、向坏的方向、(化)过 perturb, pervert, peroxide, perambulate
post- 时间之后,场所之后 post-war, posterior, posterity, postern, postgraduate
pre- 以前的、前有的 prearrage, preengangement, prefix
preter- 超、过 preterhuman, preternatural
pro- 前、在前、代替、赞成、偏袒 prohibit, procathedral, pro-Communist, probationary
pseudo- 假冒的、假的、假装的、疑似的 pseudo-science, pseudograph, pseudonym
re- 1、再一次、重新 readjust, rebuild
2、反复 redouble
3、返回、恢复原状 recall, retreat
4、在…之后 remain
retro- 向后、倒退、追溯 retrospect, retroact , retrocede, retroflex, retrogress
self- 自身的、自己的 self-abuse, self-acting, self-assurance
semi- 一半、部分地、不完全地、两次 semiannual, semicircle
step- 姻亲关系的、继 stepchild
sub- 1、下、稍微、约略、近、附属、助理、更、再 submerge, subalpine, subeditor, subdivide, 
2、在c,f,g,m,r,s之前常变为
suc -,suf-,sug-,
sum-,sur-,sus-
succinct, suffragan, surrealistic
super- 在…之上、更加、附加的、比…优越、超越、过度 superimpose, superscribe, superadd
sym- 一起 symbiosis, sympathy
syn- 共同,同时、相似 synchronous, synonym
tele- 远的、远距离的、为电视的 telephone, telescope
theo- 神的 theocentric, theocracy
trans- 横过,越过、贯通、在另一边、转变为、超越 transcontinental, transpierce, transatlantic, transform
tri- 三、三层、三重、三倍 triad, triangle
ultra- 超过、…范围之外、超…、过于、极端的 ultra-conservative, ultra-fashionable
un- 1、加动词,相反的行为及状态 unlock
2、附加于否定意义的动词前强调否定意义 unloose
3、加名词,去除原来的性质、形态 unfrock
4、加形容词,副词、名词表示否定 unconscious, unmistakably, untruth
under- 1、下面的、下方的、次于、低于、从属于 underground, under-side
2、接动词及其衍生词表不完全地,不充分地 underdeveloped, under-sexed
uni- 单一的 unicameral, unicellular, uniform
vice- 1、代理的、副的、次的 vice-chairman