Etymology
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fallacy (n.)

late 15c., "deception, false statement," from Latin fallacia "deception, deceit, trick, artifice," abstract noun from fallax (genitive fallacis) "deceptive," from fallere "deceive" (see fail (v.)). Specific sense in logic, "false syllogism, invalid argumentation," dates from 1550s. An earlier form was fallace (c. 1300), from Old French fallace.

updated on October 11, 2014

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Definitions of fallacy from WordNet

fallacy (n.)
a misconception resulting from incorrect reasoning;
Synonyms: false belief
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.