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Noun: radon  'rey,dón
  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
    - Rn, atomic number 86

Derived forms: radons

Type of: argonon, chemical element, element, inert gas, noble gas

Encyclopedia: Radon, Orne