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antihydrogen

[an-tee-hahy-druh-juh n, an-tahy-] /ˌæn tiˈhaɪ drə dʒən, ˌæn taɪ-/
noun, Physics.
1.
the antimatter counterpart to hydrogen.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anti hydrogen

antihydrogen

/ˈæntɪˌhaɪdrədʒən/
noun
1.
hydrogen in which the nucleus is an antiproton with an orbiting positron
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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anti hydrogen in Science
antihydrogen
  (ān'tē-hī'drə-jən, ān'tī-)   
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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