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The Collaborative International Dictionary of English v.0.48:

Nassa \Nas"sa\, n.; pl. E. Nassas, L. Nassae. [From L. nassa a kind of basket, in allusion to the reticulation of some species.] (Zool.) Any species of marine gastropods, of the genera Nassa, Tritia, and other allied genera of the family Nassidae; a dog whelk. See Illust. under Gastropoda. [1913 Webster] -- nas"soid, a. [1913 Webster]