GNU Collaborative International Dictionary of English

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1.       
   Turritella , n. [NL., dim fr. L. turris tower.] (Zool.) Any spiral marine gastropod belonging to Turritella and allied genera. These mollusks have an elongated, turreted shell, composed of many whorls. They have a rounded aperture, and a horny multispiral operculum.
   1913 Webster