americium Hear it!

americium definition

☆ am·er·ic·ium (am′ər is̸h′ē əm, -is′-)

noun

a radioactive, metallic chemical element, one of the actinides, produced by the beta decay of an isotope of plutonium: symbol, Am; at. no., 95

Etymology: ModL, after Americ(a) + -ium: so named by Glenn T(heodore) Seaborg, one of its discoverers, by analogy with europium, the corresponding rare earth

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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