Source : Webster's Revised Unabridged Dictionary (1913)

Jonah \Jo"nah\, n.
   The Hebrew prophet, who was cast overboard as one who
   endangered the ship; hence, any person whose presence is
   unpropitious.

   {Jonah crab} (Zo["o]l.), a large crab ({Cancer borealis}) of
      the eastern coast of the United States, sometimes found
      between tides, but usually in deep water.

Source : WordNet®

Jonah
     n 1: (Old Testament) Jonah did not wish to become a prophet so
          God caused a great storm to throw him overboard from a
          ship; he was saved by being swallowed by a whale that
          vomited him out onto dry land
     2: a person believed to bring bad luck to those around him
        [syn: {jinx}]
     3: a book in the Old Testament that tells the story of Jonah
        and the whale [syn: {Book of Jonah}]