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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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