| 单词 | iridium-pointed |
| 释义 | > as lemmasiridium-pointed A white metal of the platinum group, resembling polished steel, and fusible with great difficulty, found (usually in conjunction with osmium) in native platinum, and in the native alloy iridosmium n. Chemical symbol Ir; atomic weight 193. Also in combinations, as iridium-pointed adj. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > iridium > [noun] iridium1804 society > occupation and work > materials > derived or manufactured material > metal > base metal > [noun] > metals of platinum group > specific palladium1803 iridium1804 osmium1804 rhodium1804 1804 Tennant in Philos. Trans. (Royal Soc.) 94 414 I should incline to call this metal Iridium, from the striking variety of colours which it gives, while dissolving in marine acid. 1805 W. H. Wollaston in Philos. Trans. (Royal Soc.) 95 317 Metals that were found by Mr. Tennant..and which he has called Iridium and Osmium. 1849 D. Campbell Pract. Text-bk. Inorg. Chem. 259 Iridium is not unlike platinum..though harder, and less easily acted upon by acids. 1871 J. Tyndall Fragm. Sci. (1879) II. xvi. 442 When sent through a short bar of iridium, this refractory metal emits a light of extraordinary splendour. < as lemmas |
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