2 definitions
for Mollusk
From The Collaborative International Dictionary of English v.0.48 :
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]
From WordNet (r) 2.0 :
mollusk
n : invertebrate having a soft unsegmented body usually enclosed
in a shell [syn: mollusc, shellfish]