burstone

or buhr·stone, burr·stone

[ bur-stohn ]
/ ˈbɜrˌstoʊn /

noun

any of various siliceous rocks used for millstones.
a millstone of such material.
Also called buhr, burr.

Origin of burstone

Example sentences from the Web for burstone

British Dictionary definitions for burstone

burstone
/ (ˈbɜːˌstəʊn) /

noun

a variant spelling of buhrstone