burrstone
[机] 磨石
发音
/ˈbɚstoʊn/
词形变化
burrstones
复数
burrstones
别名
buhrstone
burstone
释义与例句
n.
-
1.
A tough, silicified limestone formerly used to make millstones, typified by the presence of multiple cavities that originally housed fossilized shells.
可数 不可数