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.
Also, mollusc.

1775–85; < French mollusque < Neo-Latin Mollusca; see Mollusca

molluskan, molluscan [muh-luhs-kuhn] , adjective, noun
mollusklike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mollusc or mollusk (ˈmɒləsk)
any invertebrate of the phylum Mollusca, having a soft unsegmented body and often a shell, secreted by a fold of skin (the mantle). The group includes the gastropods (snails, slugs, etc), bivalves (clams, mussels, etc), and cephalopods (cuttlefish, octopuses, etc)
[C18: via New Latin from Latin molluscus, from mollis soft]
mollusk or mollusk
[C18: via New Latin from Latin molluscus, from mollis soft]
molluscan or mollusk
adj, —n
molluskan or mollusk
adj, —n
'mollusc-like or mollusk
'mollusk-like or mollusk

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1783, from Fr. mollusque, from Mod.L. Mollusca, order name, adopted by Linnæus 1758 from L. mollusca, neut. pl. of molluscus "thin-shelled," from mollis "soft," from PIE base *mel-/*mol-/*ml- "grind." Linnæus applied the word to a heterogeneous group of invertebrates, not originally including
mollusks with shells; the modern scientific use is after a classification proposed 1790s by Fr. naturalist Georges Léopole Chrétien Frédéric Dagobert, Baron Cuvier (1769-1832).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
mollusk or mollusc   (mŏl'əsk)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is about half crustaceans and the rest would be mollusk and other things.
Worse, it is hunted by crabs that try to crush the mollusk between strong claws.
Take the mollusk for instance, the only animal born with a shell.
Members of the mollusk family, nudibranchs abandoned their shells millions of
  years ago.
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