Definitions of crustacea

  1. Crustacean.
  2. A class of animals whose bodies are covered with a crust- like shell covering, such as lobsters, shrimps, and crabs.
  3. Animals with jointed shells, like crabs and lobsters.
  4. class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas
  5. Crustaceous.
  6. One of the classes of the articulata, including lobsters, shrimps, and crabs, so called from the crust- like shell which covers the body and legs.