Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps


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, inert gas, noble gas

Encyclopedia: Radon, Orne