mollusca definition

  • noun:
    • among leading divisions of invertebrated animals; an extensive number of invertebrates whose figures are smooth, without any jointed feet, and frequently covered with a tough shell in one single, two, or higher pieces, and whose major parts tend to be neither segmented into a series of longitudinal rings, as in pests, crustaceans, and worms, nor radiately arranged, as with echinoderms; the mollusks, since the univalve or bivalve shell-fish of ordinary language.
    • gastropods; bivalves; cephalopods; chitons

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