- a hard, siliceous rock used to make millstones
- a millstone cut from such a rock
Origin of buhrstonebuhr, variant, variety of burr + stone
A tough, silicified limestone formerly used to make millstones. It is typified by the presence of multiple cavities that originally housed fossilized shells.
Origin of buhrstoneVariant of burr 1 stone
- Alternative spelling of burrstone.