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Actinon

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

n. A radioactive, inert, gaseous isotope of radon, with a half-life of 3.92 seconds.

Wiktionary, Creative Commons Attribution/Share-Alike License

n. Any of the radioactive isotopes of radon

n. Any radioactive isotope of an actinide

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

n. any of a series of radioactive elements with atomic numbers 89 through 103

Word Usage

"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"

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