The Collaborative International Dictionary
Myth \Myth\ (m[i^]th), n. [Written also mythe.] [Gr. my^qos myth, fable, tale, talk, speech: cf. F. mythe.]
A story of great but unknown age which originally embodied a belief regarding some fact or phenomenon of experience, and in which often the forces of nature and of the soul are personified; an ancient legend of a god, a hero, the origin of a race, etc.; a wonder story of prehistoric origin; a popular fable which is, or has been, received as historical.
A person or thing existing only in imagination, or whose actual existence is not verifiable.
As for Mrs. Primmins's bones, they had been myths these twenty years.
Myth history, history made of, or mixed with, myths.
n. (obsolete form of myth English)