neptunium
☆ nep·tu·nium (nep to̵̅o̅′nē əm, -tyo̵̅o̅′-)
noun
Etymology: ModL < Neptunus, Neptune + -ium: so named by Edwin Mattison McMillan & P. Abelson (1913-2004), U.S. physicists, because its at. no. is next after uranium's, as the planet Neptune is next beyond Uranus
Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
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