| 单词 | alum |
| 释义 | Word Frequency alum 1(ˈæləm) noun 1. Also called: potash alum a colourless soluble hydrated double sulphate of aluminium and potassium used in the manufacture of mordants and pigments, in dressing leather and sizing paper, and in medicine as a styptic and astringent. Formula:K2SO4.Al2(SO4)3.24H2O 2. any of a group of isomorphic double sulphates of a monovalent metal or group and a trivalent metal. Formula:X2SO4.Y2(SO4)3.24H2O, where X is monovalent and Y is trivalent Word origin C14: from Old French, from Latin alūmenWord Frequency alum 2(ˈæləm) noun informal, mainly US and Canadian an alumnus or alumna |
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