(n)(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
n. The Hebrew prophet, who was cast overboard as one who endangered the ship; hence, any person whose presence is unpropitious. [ 1913 Webster ]
Jonah crab (Zool.), a large crab (Cancer borealis) of the eastern coast of the United States, sometimes found between tides, but usually in deep water. [ 1913 Webster ]