[an-tee-at-uhm, an-tahy-]
noun Physics.
an atom of antimatter.

1965–70; anti- + atom Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
antiatom   (ān'tē-āt'əm, ān'tī-)  Pronunciation Key 
An atom composed of antiparticles. An antiatom consists of positrons, antiprotons, and antineutrons. It has the same mass and spin as an ordinary atom, and the same amount of charge and magnetic moment, but the charge and magnetic moment are the opposite of those of an ordinary atom.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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