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tusk shell

1860-65, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tusk shell

tusk shell

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 Scaphopoda Also called tooth shell
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Encyclopedia Article for tusk shell

tooth shell

any of several marine mollusks of the class Scaphopoda. There are four genera of tusk shells (Dentalium is typical and most common) and more than 350 species. Most tusk shells live in fairly deep water, sometimes to depths of about 4,000 metres (13,000 feet); many deep-sea species are cosmopolitan in distribution

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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