any of various earthy substances yielding alum or alumina.
单词 | θ6415 |
释义 | the world > the earth > minerals > ore > [noun] > metal ore > alum ore (4) alum earth1612 any of various earthy substances yielding alum or alumina. alum slate1675 = alum shale n. alum ore1725 an iron ore or iron-rich rock which contains substantial amounts of alum; spec. = alum shale n. bing1815 spec. A heap of metallic ore, of alum; a definite quantity (8 cwt.) of lead ore. |
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