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[an-tee-proh-ton, an-tahy-] /ˈæn tiˌproʊ tɒn, ˈæn taɪ-/
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 of antiproton
1935-40; anti- + proton Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for antiproton
  • 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.
British Dictionary definitions for antiproton


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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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antiproton in Science
  (ān'tē-prō'tŏn', ān'tī-)   
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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