Rn
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
a graduate nurse who has passed examinations for registration
Origin
Borrowed from other languages: * (Brazil): From Portuguese RN, from Rio Grande do Norte, from rio+norte. * (Italy): From Italian RN, from Regia Nave, from regia (“royal”)+nave (“ship”).
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.