Buhrstone - definition of buhrstone by The Free .
buhr·stone also burr·stone (bûr′stōn′) n. A tough, silicified limestone formerly used to make millstones. It is typified by the presence of ple cavities that originally housed fossilized shells. [Variant of burr + stone.] buhrstone (ˈbɜːˌstəʊn), burstone or burrstone n 1. (Geological Science) a hard tough rock containing silica ...
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