buhrstone


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buhr·stone

also burr·stone  (bûr′stōn′)
n.
A tough, silicified limestone formerly used to make millstones. It is typified by the presence of multiple 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, fossils, and cavities, formerly used as a grindstone
2. (Mechanical Engineering) a grindstone or millstone made of this rock
[C18 burr, perhaps identical to burr1 (alluding to roughness)]

buhr•stone

(ˈbɜrˌstoʊn)

n.
any of various siliceous rocks used for millstones.
[1685–95]
References in periodicals archive ?
Moore has spent years searching for millstones from these French quarries, called buhrstones, many of which have been tossed aside in the techno-pace of today.
Key to his business philosophy, indeed to producing what Moore feels is the best quality grain available, is the use of these French buhrstones.