positronium Hear it!

positronium definition

☆ posi·tro·nium (päz′i trō′nē əm)

noun

a short-lived atomic system formed of an electron and a positron before they interact to annihilate each other

Etymology: positron + -ium

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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