Definitions for uropodˈyʊər əˌpɒd
Random House Webster's College Dictionary
(in crustaceans) an appendage on the last abdominal segment, as on either side of the tailfan of lobsters.
Origin of uropod:
u•rop•o•dalyʊˈrɒp ə dl(adj.)u•rop′o•dous
either of the two posterior abdominal appendages of the lobster, shrimp and some other crustaceans
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