| 单词 | osmium |
| 释义 | osmium /oz"mee euhm/, n. Chem. a hard, heavy, metallic element having the greatest density of the known elements and forming octavalent compounds, as OsO4 and OsF8: used chiefly as a catalyst, in alloys, and in the manufacture of electric-light filaments. Symbol: Os; at. wt.: 190.2; at. no.: 76; sp. gr.: 22.57. [1795-1805; < NL < Gk osm(é) smell + -ium -IUM; named from the penetrating odor of one of its oxides] |
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