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n. pl. shellfish or shell·fish·es
1. Any of various edible aquatic invertebrate animals having a shell, especially mollusks such as clams and oysters, and crustaceans such as lobsters, crabs, and shrimp.
2. An edible mollusk, in contrast to a crustacean: regulations concerning fish, crustaceans, and shellfish.
3. The edible flesh of such animals.
the act or occupation of fishing for shellfish.