uropod
CIDE DICTIONARY
uropod, n. [2d uro- + -pod.].
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
Stomapoda. [
1913 Webster]
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uropod" in Webster Dictionary Online