Etymology
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mollusk (n.)

"soft-bodied invertebrate animal, usually with an external shell," 1783, mollusque (modern spelling from 1839), from French mollusque, from Modern Latin Mollusca (see Mollusca), the phylum name. Related: Molluscuous; molluscan.

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Definitions of mollusk

mollusk (n.)
invertebrate having a soft unsegmented body usually enclosed in a shell;
Synonyms: mollusc / shellfish
From wordnet.princeton.edu