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Ian"thina (), n.; pl. L. Ianthin (), E. Ianthinas (). [NL., fr. L. ianthinus violet-blue, Gr. ; violet + flower.] (Zol.) Any gastropod of the genus Ianthina, of which various species are found living in mid ocean; -- called also purple shell, and violet snail. [Written also janthina.] It floats at the surface by means of a raft, which it constructs by forming and uniting together air bubbles of hardened mucus. The Tyrian purple of the ancients was obtained in part from mollusks of this genus. [Image]
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