RN /ˌɑrˈɛn/
Rn
n 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 [syn: radon, atomic
number 86]
2: a graduate nurse who has passed examinations for
registration [syn: registered nurse]