alum ore
now historical
noun
An iron ore or iron-rich rock which contains substantial amounts of alum; specifically = alum shale.
Origin
Early 18th century; earliest use found in Peter Shaw (1694–1763), physician and author.
| 单词 | alum ore |
| 释义 | alum orenow historical noun An iron ore or iron-rich rock which contains substantial amounts of alum; specifically = alum shale. Origin |
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