Noun shellfish has 2 senses
  1. shellfish - meat of edible aquatic invertebrate with a shell (especially a mollusk or crustacean)
    --1 is a kind of
    seafood
    --1 is a part of mollusk, mollusc, shellfish
    --1 has particulars:
     mussel; huitre, oyster; clam; cockle; crab, crabmeat; crayfish, crawfish, crawdad, ecrevisse; limpet; lobster; spiny lobster, langouste, rock lobster, crayfish; scallop, scollop, escallop
  2. mollusk, mollusc, shellfish - invertebrate having a soft unsegmented body usually enclosed in a shell
    --2 is a kind of invertebrate
    --2 is a member of Mollusca, phylum Mollusca
    --2 has parts: carapace, shell, cuticle; shellfish
    --2 has particulars:
     scaphopod; gastropod, univalve; chiton, coat-of-mail shell, sea cradle, polyplacophore; bivalve, pelecypod, lamellibranch; cephalopod, cephalopod mollusk
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