An Etymological Dictionary of Astronomy and Astrophysics

A traditional or legendary story, usually concerning some being or hero or event, with or without a determinable basis of fact or a natural explanation, especially one that is concerned with deities or demigods and explains some practice, rite, or phenomenon of nature (Dictionary.com).

Etymology (EN): From Fr. mythe and directly from M.L. mythus, from Gk. mythos “speech, thought, story, speech, account,” of unknown origin.

Etymology (PE): Osturé, from Ar. usturat, from Gk. historia, → history.