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18.222.121.24
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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 RN /ˌɑrˈɛn/

From: WordNet (r) 2.0

 Rn
      n 1: a radioactive gaseous element formed by the disintegration
           of radium; the heaviest of the inert gasses; occurs
           naturally (especially in areas over granite) and is
           considered a hazard to health [syn: radon, atomic
            number 86]
      2: a graduate nurse who has passed examinations for
         registration [syn: registered nurse]