| 单词 | iridium |
| 释义 | iridium /i rid"ee euhm, uy rid"-/, n. Chem. a precious metallic element resembling platinum: used in platinum alloys and for the points of gold pens. Symbol: Ir; at. wt.: 192.2; at. no.: 77; sp. gr.: 22.4 at 20°C. [1804; < L irid-, s. of iris rainbow (see IRIS) + -IUM; so named from its iridescence when dissolved in hydrochloric acid] |
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