An Etymological Dictionary of Astronomy and Astrophysics

Logic: An → error in → reasoning that renders an → argument logically → invalid such as affirming the → consequent and → denying the → antecedent.

Etymology (EN): From L. fallacia “deception,” from fallere
“to deceive, trick, cheat; fail, be defective.”

Etymology (PE): Titâl (Dehxodâ) “deceit; deceiving speech, fallacious words;” cf. Tabari titâl hâ kərdan “to deceive (somebody) wheedlingly,” Pashtu titâl “duplicity, guile, deceit, fraud.”