( n. )
A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; -- also called feather alum, and hair salt.
( n. )
A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; -- also called feather alum, and hair salt.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012