an·to·nym

[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

an·ton·y·mous [an-ton-uh-muhs] , an·to·nym·ic, adjective
an·ton·y·my, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
antonym (ˈæntənɪm) [Click for IPA pronunciation guide]
 
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Antonyms is always a great word to know.
So is slumgullion. Does it mean:
a fool or simpleton; ninny.
a stew of meat, vegetables, potatoes, etc.
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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American Heritage
Cultural Dictionary
antonyms [(an-tuh-nimz)]

Two words with opposite meanings. Cold and hot are antonyms; so are small and large. (Compare synonyms.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Identify antonyms, synonyms, and homonyms for given words within text.
Antithesis and alter ego are functionally antonyms.
The two are so tightly coupled that they are practically antonyms.
The antonym of design is not evolution, the antonyms of design are accident and
  coincidence.
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