What is the meaning of Buhrstone?

(n.) A cellular, flinty rock, used for mill stones.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). buhrstone. Retrieved September 26, 2026, from http://smartdefine.org/buhrstone/definitions/1982997
ChicagoWebster's. 2011. "buhrstone" http://smartdefine.org/buhrstone/definitions/1982997 (accessed September 26, 2026).
HarvardWebster's 2011, buhrstone, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/buhrstone/definitions/1982997>.
MLAWebster's. "buhrstone" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/buhrstone/definitions/1982997>