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burstone

or buhr·stone, burr·stone

[bur-stohn]
noun
  1. any of various siliceous rocks used for millstones.
  2. a millstone of such material.
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Origin of burstone

bur(r)4 + stone
Also called buhr, burr.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for burstone

Historical Examples of burstone

  • With the march of improvement, burstone mills went into the discard.

    All About Coffee

    William H. Ukers

  • Rynd, rind, n. in a burstone mill, the iron which supports the upper stone.

British Dictionary definitions for burstone

burstone

noun
  1. a variant spelling of buhrstone
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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