From Longman Dictionary of Contemporary Englishantonyman‧to‧nym /ˈæntənɪm/ ●○○ noun [countable] SLa word that means the opposite of another word → synonym a dictionary of synonyms and antonyms
Examples from the Corpus
antonym• A dictionary of synonyms and antonyms might also be useful.• For example, the words hot and cold are antonyms that describe physical temperature.• With pairs of antonyms, if one member undergoes a metaphorical extension, the other tends to change in a parallel fashion.Origin antonym (1800-1900) French antonyme, from Greek anti- ( → ANTI-) + onyma “name” 