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hornstone

[hawrn-stohn]
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noun Archaic.
  1. a variety of quartz resembling flint.
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Origin of hornstone

1720–30; translation of German Hornstein
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for hornstone

hornstone

noun
  1. another name for chert, hornfels
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Word Origin

C17: translation of German Hornstein; so called from its appearance
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