A‐lu″no‐gen (�), n. [F. alun alum + -gen.] (Min.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.