Definition: mollusk

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Source: WordNet (r) 1.7 

mollusk
     n : invertebrate having a soft unsegmented body usually enclosed
         in a shell [syn: mollusc, shellfish]

Source: Webster's Revised Unabridged Dictionary (1913) 

Mollusk \Mol"lusk\, n. [F. mollusque, L. mollusca a kind of soft
   nut with a thin shell, fr. molluscus soft, mollis soft. See
   Mollify.] (Zo["o]l.)
   One of the Mollusca. [Written also mollusc.]