shellfish

from WordNet (r) 3.0 (2006)
shellfish
    n 1: meat of edible aquatic invertebrate with a shell
         (especially a mollusk or crustacean)
    2: invertebrate having a soft unsegmented body usually enclosed
       in a shell [syn: {mollusk}, {mollusc}, {shellfish}]
from The Collaborative International Dictionary of English v.0.48
Shellfish \Shell"fish`\, n. (Zool.)
   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.
   [1913 Webster]
from Moby Thesaurus II by Grady Ward, 1.0
24 Moby Thesaurus words for "shellfish":
      Dungeness crab, Japanese crab, blue point, clam, coquillage, crab,
      crawdad, crawfish, crayfish, langouste, limpet, littleneck clam,
      lobster, mussel, oyster, periwinkle, prawn, quahog, scallop,
      shrimp, snail, soft-shell crab, steamer, whelk
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