Any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton.
Animal with hard shell.
One of the class of arthropods that includes crabs, lobsters, shrimps, woodlice, and barnacles. The external skeleton is made of protein and chitin hardened with lime. Each segment bears a pair of appendages that may be modified as sensory feelers (antennae), as mouthparts, or as swimming, walking, or grasping structures.

Meat of edible aquatic invertebrate with a shell (especially a mollusk or crustacean).
Popular name for mollusks and crustaceans, including the whelk and periwinkle, mussel, oyster, lobster, crab, and shrimp.
shell-fish.

Class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas; Also called: class Crustacea.