The Collaborative International Dictionary of English v.0.48:

Myth \Myth\ (m[i^]th), n. [Written also mythe.] [Gr. my^qos
   myth, fable, tale, talk, speech: cf. F. mythe.]
   1. 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.
      [1913 Webster]

   2. A person or thing existing only in imagination, or whose
      actual existence is not verifiable.
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            As for Mrs. Primmins's bones, they had been myths
            these twenty years.                   --Ld. Lytton.
      [1913 Webster]

   Myth history, history made of, or mixed with, myths.
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The Collaborative International Dictionary of English v.0.48:

Mythe \Mythe\, n.
   See Myth. --Grote.
   [1913 Webster] Mythic