burrstone
[
bur
-stohn]
/ˈbɜrˌstoʊn/
noun
1.
burstone
.
British Dictionary definitions for
burrstone
buhrstone
/
ˈbɜːˌstəʊn
/
noun
1.
a hard tough rock containing silica, fossils, and cavities, formerly used as a grindstone
2.
a grindstone or millstone made of this rock
Word Origin
C18
burr
, perhaps identical to
burr
1
(alluding to roughness)
burrstone
/
ˈbɜːˌstəʊn
/
noun
1.
a variant spelling of
buhrstone