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Noun: Rn
  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
    - radon, atomic number 86
Noun: RN
  1. A graduate nurse who has passed examinations for registration
    - registered nurse

Type of: argonon, chemical element, element, inert gas, noble gas, nurse, sister [Brit]

Encyclopedia: Rn