anti-

anti-

a prefix meaning “against,” “opposite of,” “antiparticle of,” used in the formation of compound words (anticline ); used freely in combination with elements of any origin (antibody; antifreeze; antiknock; antilepton ).
Also, before a vowel, ant-.


Origin:
Middle English < Latin < Greek, prefixal use of antí; akin to Sanskrit ánti opposite, Latin ante, Middle Dutch ende (> Dutch en and), English an- in answer. Cf. ante-, and

ante, ante-, anti-, auntie.
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World English Dictionary
anti-
 
prefix
1.  against; opposing: anticlerical; antisocial
2.  opposite to: anticlimax; antimere
3.  rival; false: antipope
4.  counteracting, inhibiting, or neutralizing: antifreeze; antihistamine
5.  designating the antiparticle of the particle specified: antineutron
 
[from Greek anti]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

anti-
L. anti- from Gk. anti "against, opposite, instead of," from PIE *anti (see ante).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anti- or ant-
pref.

  1. Opposite: antimere.

  2. Opposing; against: antisocial.

  3. Counteracting; neutralizing: antibody.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
anti-  
A prefix whose basic meaning is "against." It is used to form adjectives that mean "counteracting" (such as antiseptic, preventing infection). It is also used to form nouns referring to substances that counteract other substances (such as antihistamine, a substance counteracting histamine), and nouns meaning "something that displays opposite, reverse, or inverse characteristics of something else" (such as anticyclone, a storm that circulates in the opposite direction from a cyclone). Before a vowel it becomes ant-, as in antacid.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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