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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

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