| 单词 | radium |
| 释义 | radium /ray"dee euhm/, n. 1. Chem. a highly radioactive metallic element whose decay yields radon gas and alpha rays. Symbol: Ra; at. wt.: 226; at. no.: 88. 2. a lustrous rayon or silk fabric constructed in plain weave and used in women's apparel, lining, and drapery. [1895-1900; < NL, equiv. to L rad(ius) ray (see RADIUS) + -ium -IUM] |
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