antiproton

[an-tee-proh-ton, an-tahy-]
noun Physics.
an elementary particle having negative charge equal in magnitude to that of the electron and having the same mass and spin as a proton; the antiparticle of the proton.

Origin:
1935–40; anti- + proton

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World English Dictionary
antiproton (ˈæntɪˌprəʊtɒn)
 
n
the antiparticle of the proton; a particle having the same mass as the proton but an equal and opposite charge

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
antiproton   (ān'tē-prō'tŏn', ān'tī-)  Pronunciation Key 
The antiparticle that corresponds to the proton.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for antiprotons
As a result, scientists had to develop a number of techniques for creating antiprotons.
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