'Mollusk' definitions:

Definition of 'mollusk'

From: WordNet
noun
Invertebrate having a soft unsegmented body usually enclosed in a shell [syn: mollusk, mollusc, shellfish]

Definition of 'Mollusk'

From: GCIDE
  • Mollusk \Mol"lusk\, n. [F. mollusque, L. mollusca a kind of soft nut with a thin shell, fr. molluscus soft, mollis soft. See Mollify.] (Zool.) One of the Mollusca. [Written also mollusc.] [1913 Webster]