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American Heritage® Dictionary of the English Language, Fourth Edition
- n. A radioactive, inert, gaseous isotope of radon, with a half-life of 3.92 seconds.
- n. any of a series of radioactive elements with atomic numbers 89 through 103
- actin(ium) + -on2. (American Heritage® Dictionary of the English Language, Fourth Edition)
“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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