| alun |
| alundum | (n) a substance made of fused alumina |
| Alunite | n. (Min.) Alum stone. [ 1913 Webster ] |
| Alunogen | 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. [ 1913 Webster ] |