mollusk

or mol·lusc

[ mol-uh sk ]
/ ˈmɒl əsk /

noun

any invertebrate of the phylum Mollusca, typically having a calcareous shell of one, two, or more pieces that wholly or partly enclose the soft, unsegmented body, including the chitons, snails, bivalves, squids, and octopuses.

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Origin of mollusk

1775–85; < French mollusque < New Latin Mollusca; see Mollusca

OTHER WORDS FROM mollusk

mol·lus·kan, mol·lus·can [muh-luhs-kuh n] /məˈlʌs kən/, adjective, nounmol·lusk·like, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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Scientific definitions for mollusk

mollusk

Any of numerous invertebrate animals of the phylum Mollusca, usually living in water and often having a hard outer shell. They have a muscular foot, a well-developed circulatory and nervous system, and often complex eyes. Mollusks include gastropods (snails and shellfish), slugs, octopuses, squids, and the extinct ammonites. Mollusks appear in the fossil record in the early Cambrian Period, but it is not known from what group they evolved.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.