| Shellfish (n.) 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. Thesaurus Entries 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 |