MOLLUSK

mollusk, mollusc, shellfish

(noun) invertebrate having a soft unsegmented body usually enclosed in a shell

Source: WordNet® 3.1

Noun

mollusk (plural mollusks)

(American spelling) Alternative form of mollusc

Source: Wiktionary

Mol"lusk, n. Etym: [F. mollusque, L. mollusca a kind of soft nut with a thin shell, fr. molluscus soft, mollis soft. See Mollify.] (Zoöl.)

Definition: One of the Mollusca. [Written also mollusc.]

Source: Webster’s Unabridged Dictionary 1913 Edition