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From The Collaborative International Dictionary of English v.0.48:
Jonah \Jo"nah\, 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]