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Definition of shellfish:

  1. Any aquatic animal whose external covering consists of a shell, either testaceous, as in oysters, clams, and other mollusks, or crustaceous, as in lobsters and crabs.


crustaceous animal, malacostran, laemadipod, molluskan type, crawfish, boxfish, marine invertebrate, clam, branchiopod, shrimp, gastropod, crayfish, Arthropoda, mussel, snail, trilobite, invertebrate, molluscoid, abalone, isopod, arthropod, piddock, oyster, prawn, quahog, lobster, scallop, cockle, mollusc, whelk, bivalve, corepod, marine animal, mollusk, Arthropoda.

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