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 ofradon - 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.]
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Examples
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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. 1971
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I think a class actinon law suit will open there eyes.
unknown title 2009
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