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Definition of: crustacean
(krus·tā′shən) noun
One of a class of arthropods (Crustacea) having crustlike shells, and generally aquatic, including lobsters, crabs, barnacles, sow-bugs, etc.
—adjective Of or pertaining to the Crustacea. [<NL Crustacea <L crusta crust; with ref. to the shell]
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