plume alum
now rare
noun
A mineral consisting of a double sulphate of aluminium and iron, occurring as tufts of silky, fibrous crystals.
Origin
Early 17th century; earliest use found in Richard Surflet (fl. 1600–1616), translator.
| 单词 | plume alum |
| 释义 | plume alumnow rare noun A mineral consisting of a double sulphate of aluminium and iron, occurring as tufts of silky, fibrous crystals. Origin |
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