turritella

noun
tur·​ri·​tel·​la | \ ˌtərəˈtelə\

Definition of turritella

1 capitalized : a genus (the type of the family Turritellidae) of marine gastropod mollusks having an elongated turreted shell composed of many whorls with a rounded aperture and a horny multispiral operculum
2 or less commonly turritellid \ -​lə̇d \ plural -s : any mollusk or shell of the genus Turritella or family Turritellidae — see screw shell

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History and Etymology for turritella

New Latin, irregular from Latin turris + New Latin -ella

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