n.
Pronunciation: ˌ kr ə s- ' t ā -sh ə n
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