antonym

[an-tuh-nim]
noun
a word opposite in meaning to another. Fast is an antonym of slow. Compare synonym ( def 1 ).

Origin:
1865–70; ant- + (syn)onym

antonymous [an-ton-uh-muhs] , antonymic, adjective
antonymy, noun
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World English Dictionary
antonym (ˈæntənɪm)
 
n
a word that means the opposite of another word: ``empty'' is an antonym of ``full''
 
[C19: from Greek antōnumia, from anti- + onoma name]
 
antonymous
 
adj

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Etymonline
Word Origin & History

antonym
1870, created to serve as opposite of synonym, from Gk. anti- "equal to, instead of, opposite" (see anti-) + -onym "name" (see name).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The term anesthetic is an antonym of aesthetic.
This is probably the result of the association of covert with its antonym
  overt, which is pronounced with a long o.
Opposites are also referred to as antonyms.
The antonym of design is not evolution, the antonyms of design are accident and
  coincidence.
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