mollusk Meaning, Definition & Usage

  1. noun invertebrate having a soft unsegmented body usually enclosed in a shell
    mollusc; shellfish.

WordNet

Mol"lusk noun
Etymology
F. mollusque, L. mollusca a kind of soft nut with a thin shell, fr. molluscus soft, mollis soft. See Mollify.
Definitions
  1. (Zoöl.) One of the Mollusca. Written also mollusc.

Webster 1913