'RN' definitions:

Definition of 'Rn'

From: WordNet
noun
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, Rn, atomic number 86]
noun
A graduate nurse who has passed examinations for registration [syn: registered nurse, RN]

Definition of 'Rn'

From: GCIDE
  • Rn \Rn\, n. (Chem.) the symbol for the chemical element radon. [PJC]

Synonyms of 'RN'

From: Moby Thesaurus