Definitions

1. noun

a member of the subphylum Crustacea, including crabs, lobsters, and shrimp.

“The marine biologist studied the behavior of various crustaceans in their natural habitats.”

2. noun

a type of animal that lives in water and has a hard outer shell.

“The crustacean was caught in a net by the fishermen and sold at the market.”

3. noun

a crustacean shell or exoskeleton.

“The crustacean shell was carefully cleaned and preserved for scientific study.”