Meanings
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1
noun
an arthropod such as a crab, lobster, shrimp, or barnacle, usually with a hard shell
A crab is a crustacean with a jointed body and hard shell.
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2
adj
relating to crustaceans
The biologist studied crustacean larvae under the microscope.
Thesaurus
Etymology
From the taxonomic name Crustacea plus -an. Crustacea comes from Latin crusta, "shell, crust," pointing to the hard outer covering of many members of the group.