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. Many of the millstones used in the current 83,000-square-foot facility were hand-cut by 15th and 19th century French artisans.