Noun: radon 'rey,dón
- A radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gases; occurs naturally (especially in areas over granite) and is considered a hazard to health
"Radon testing is recommended for homes built on granite bedrock";
- Rn, atomic number 86
Derived forms: radons
Type of: argonon, inert gas, noble gas
Encyclopedia: Radon, Orne