| 单词 | alum earth |
| 释义 | > as lemmasalum earth alum earth n. now historical any of various earthy substances yielding alum or alumina. ΘΚΠ the world > the earth > minerals > ore > [noun] > metal ore > alum ore alum earth1612 alum slate1675 alum ore1725 bing1815 the world > the earth > structure of the earth > constituent materials > earth or soil > kind of earth or soil > [noun] > mineral soil > others alum earth1612 cabook1834 laterite1893 ferricrete1902 murram1912 opal dirt1925 allite1930 Oxisol1960 1612 J. Speed Theatre of Empire of Great Brit. i. xlii. 81/1 An Allum-earth of sundrie colours. 1788 W. Nicholson tr. A.-F. de Fourcroy Elements Nat. Hist. & Chem. II. 233 The alum earth of Auvergne might be lixiviated in the same manner. 1872 W. Crookes tr. R. von Wagner Handbk. Chem. Technol. ii. 257 Alum-earth is more or less a mixture of sulphurous iron pyrites with various bituminous matters. 1906 Little Cycl. (ed. 12) 11 Alum is sometimes found pure in the earth, but most of it is made from alum rocks and alum earth. 1998 A. S. Travis Determinants Evol. European Chem. Industry 335 Natural cryolite met tough competition from..compounds with the same stoichiometric composition..produced from soda, hydrofluoric acid and alum earth. < as lemmas |
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