[an-tee-hahy-druh-juhn, an-tahy-]
noun Physics.
the antimatter counterpart to hydrogen. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antihydrogen (ˈæntɪˌhaɪdrədʒən)
hydrogen in which the nucleus is an antiproton with an orbiting positron

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
antihydrogen   (ān'tē-hī'drə-jən, ān'tī-)  Pronunciation Key 
The antimatter that corresponds to hydrogen. Antihydrogen has been useful in studies of the relationship between matter and antimatter, because its matter equivalent (hydrogen) is one of the most studied and most well understood forms of matter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Low-energy atoms of antihydrogen will enable researchers to test a fundamental
  property of the universe.
Antihydrogen is of interest for use in a precision test of nature's fundamental
Basically, the interference pattern shifts by the same amount that the
To form antihydrogen during these sessions, antiprotons were mixed with
  positrons inside the trap.
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