noun \-ˌfish\

: an animal (such as a crab or an oyster) that has a hard outer shell and that lives in water

Full Definition of SHELLFISH

:  an aquatic invertebrate animal with a shell; especially :  an edible mollusk or crustacean

Examples of SHELLFISH

  1. lobsters, crabs, and other shellfish

First Known Use of SHELLFISH

before 12th century


noun    (Concise Encyclopedia)

Any aquatic mollusk, crustacean, or echinoderm that has a shell. Oysters, mussels, scallops, and clams rank among the most commercially important. Certain gastropod mollusks, such as abalone, whelk, and conch, are also marketed. The main crustaceans are shrimp, lobster, and crab. Among echinoderms, sea urchins and sea cucumbers are locally popular. After being harvested, all shellfish are highly perishable. Many types are cooked live to protect the consumer against the effects of spoilage.


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