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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Collins
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

antiproton

subatomic particle of the same mass as a proton but having a negative electric charge and oppositely directed magnetic moment. It is the proton's antiparticle. Antiprotons were first produced and identified in 1955 by Emilio Segre, Owen Chamberlain (for which they received the Nobel Prize for Physics in 1959), and coworkers by bombarding a copper target with high-energy protons from the proton synchrotron at the University of California at Berkeley. Antiprotons were predicted in the early 1930s, but their discovery had to wait for the technology of high-energy particle accelerators to reach the 6 billion electron-volt range. A collision of an antiproton with a proton results in mutual annihilation, but a near miss may produce by charge exchange an antineutron-neutron pair

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
For example, a proton has a positive electric charge, but an antiproton has a negative electric charge.
For example, a proton has a positive charge, while an antiproton has a negative charge.
Antiproton losses are much higher in case of insufficient separation.
Luminosity is a measure of particle interaction, specifically the chance that a proton will collide with an antiproton.
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