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Definition of: mollusk
(mol′əsk) noun
Any member of a large phylum (Mollusca) of mostly marine invertebrates having a soft, unsegmented body protected usually by a calcareous shell and including snails, oysters, cuttlefish, squids, whelks, limpets, etc. Also mol lusc. [<F. mollusque <L molluscus (nux) soft, thin-shelled (nut) <mollis soft]
—mol·lus·can (mə·l
s′kən) adjective & noun
—mol·lus′cous adjective
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