( n. )
A hard, black variety of vulcanite. It may be cut and polished, and is used for many small articles, as combs and buttons, and for insulating material in electric apparatus.
( n. )
A hard, black variety of vulcanite. It may be cut and polished, and is used for many small articles, as combs and buttons, and for insulating material in electric apparatus.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012