( n. )
A stone or thick lump of glass, or kind of pestle, flat at the bottom, used for grinding pigments or drugs, etc., upon a slab of similar material.
( n. )
A stone or thick lump of glass, or kind of pestle, flat at the bottom, used for grinding pigments or drugs, etc., upon a slab of similar material.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012