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crustacean Definition
crustaceannoun 1. zool.In the animal kingdom: any invertebrate animal belonging to the large class Crustacea consisting of mainly aquatic arthropods, including crabs, lobsters, shrimps, barnacles, woodlice, etc, which typically possess two pairs of antennae and a segmented body covered by a chalky carapace.
adj 1. Relating to these creatures.
Etymology: 19c: from Latin
crusta shell.