Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A radioactive isotope of radon, Rn-219, having a half-life of 3.96 seconds and produced by the disintegration of actinium.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of the radioactive isotopes of radon
  • noun Any radioactive isotope of an actinide

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

  • noun any of a series of radioactive elements with atomic numbers 89 through 103

Etymologies

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

[actin(ium) + –on.]

Examples

  • The combat actinon in which Berg was lost is described in the last chapter of John L. Plaster's new book SOG: The Secret Wars of America's Commandos in

    Berg, Bruce A.

  • I think a class actinon law suit will open there eyes.

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