uropod

noun

uro·​pod ˈyu̇r-ə-ˌpäd 

: either of the flattened lateral appendages of the last abdominal segment of a crustacean

broadly : an abdominal appendage of a crustacean

Word History

Etymology

International Scientific Vocabulary ur- entry 2 + Greek pod-, pous foot — more at foot

First Known Use

circa 1890, in the meaning defined above