Definition of mollusc noun from the Oxford Advanced Learner's Dictionary

 

mollusc

 noun
(British English)(US English mollusk)noun
BrE BrE//ˈmɒləsk//
 
; NAmE NAmE//ˈmɑːləsk//
 
(specialist) Invertebrates
 
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any creature with a soft body that is not divided into different sections, and usually a hard outer shell. Snails and slugs are molluscs. compare bivalve, shellfish See related entries: Invertebrates Word Origin late 18th cent.: from modern Latin mollusca, neuter plural of Latin molluscus, from mollis ‘soft’.