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tusk shell

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noun
  1. tooth shell.
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Origin of tusk shell

An Americanism dating back to 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for tusk shell

tusk shell

noun
  1. any of various burrowing seashore molluscs of the genus Dentalium and related genera that have a long narrow tubular shell open at both ends: class ScaphopodaAlso called: tooth shell
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012