The story
From contr(a)- + -onym. Coined 1962 by Jack Herring. Note that the vowel of the suffix generally supersedes the vowel of the prefix, hence coined as contronym, rather than contranym.
Etymology from Wiktionary, CC BY-SA 4.0.
contronym
Today it means: A word that has two opposing meanings, such as cleave (“stick together” or “split apart”). Full definition →