Actinon

ahd-5
  • noun. A radioactive isotope of radon, Rn-219, having a half-life of 3.96 seconds and produced by the disintegration of actinium.
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  • noun. Any of the radioactive isotopes of radon
  • noun. Any radioactive isotope of an actinide
    • 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
    • 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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