Pronunciation (UK) enPR: mŏl'əsk, IPA (key): /ˈmɒləsk/ (US) enPR: mäl'əsk, IPA (key): /ˈmɑləsk/ Audio (US)(file) Noun Singular mollusc Plural molluscs (countable) A soft-bodied invertebrate of the phylum Mollusca. Most molluscs have a hard shell. Clams and octopus are examples of mollusc. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads