A myth is defined as a story without an author that is passed along and is usually intended to teach a lesson, or something that is untrue.(noun)
See myth in Webster's New World College Dictionary
Origin: LL mythos < Gr, a word, speech, story, legend
See myth in American Heritage Dictionary 4
Origin: New Latin mȳthus
Origin: , from Late Latin mȳthos
Origin: , from Greek mūthos.
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