Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • The symbol for the element radon.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Symbol for radon.

from the GNU version of the Collaborative International Dictionary of English

  • n. the symbol for the chemical element radon.

from The Century Dictionary and Cyclopedia

  • An abbreviation of Royal Naval Reserve.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a graduate nurse who has passed examinations for registration
  • n. 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

Etymologies

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