Main Entry: crus·ta·cean

Pronunciation: \ˌkrəs-ˈtā-shən\

Function: noun

Date: 1835

: any of a large class (Crustacea) of mostly aquatic mandibulate arthropods that have a chitinous or calcareous and chitinous exoskeleton, a pair of often much modified appendages on each segment, and two pairs of antennae and that include the lobsters, shrimps, crabs, wood lice, water fleas, and barnacles

— crustacean adjective