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From The Collaborative International Dictionary of English v.0.48:
Ocypodian \O`cy*po"di*an\, n. [Gr. 'wky`s swift + poy`s, podo`s, foot.] (Zool.) One of a tribe of crabs which live in holes in the sand along the seashore, and run very rapidly, -- whence the name. [1913 Webster]