actinon definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a gaseous radioisotope of radon, formed by disintegration of actinium: at. no., 86; at. wt., 219; half-life of 3.92 seconds
Origin: Modern Latin ; from actinium plush -on
actinon definition by American Heritage Dictionary
A radioactive, inert, gaseous isotope of radon, with a half-life of 3.92 seconds.
Origin: actin(ium) + -on2.