noun.
A soft-bodied invertebrate of the phylumMollusca, typically with a hard shell of one or more pieces.
noun.
A weak-willed person.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
invertebrate having a soft unsegmented body usually enclosed in a shell
Word Usage
"In each case the mollusc is a loose fit in its burrow, having ample room for rotation, but the aperture of the latter is what is known as a cassinian oval, and generally projects slightly above the surface of the coral."