carapace, cuticle, shell - hard outer covering or case of certain organisms such as arthropods and turtles

invertebrate - any animal lacking a backbone or notochord; the term is not used as a scientific classification

Mollusca, phylum Mollusca - gastropods; bivalves; cephalopods; chitons

scaphopod - burrowing marine mollusk

gastropod, univalve - a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes

coat-of-mail shell, polyplacophore, sea cradle, chiton - primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates

bivalve, lamellibranch, pelecypod - marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together

cephalopod, cephalopod mollusk - marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles

shellfish - meat of edible aquatic invertebrate with a shell (especially a mollusk or crustacean)