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From The Collaborative International Dictionary of English v.0.48:
Uropod \U"ro*pod\, n. [2d uro- + -pod.] (Zool.)
Any one of the abdominal appendages of a crustacean,
especially one of the posterior ones, which are often larger
than the rest, and different in structure, and are used
chiefly in locomotion. See Illust. of Crustacea, and