Reference meaning
Rn
Last updated
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
Related source terms
radonatomic number 86
Other meanings
2. noun
a graduate nurse who has passed examinations for registration
Source and scope
This definition is reproduced from Princeton WordNet 3.0, sense 14652104-n, under the WordNet 3.0 License. It has not yet received VocabularyBase editorial review. Read the source and license details.