an·ti·quark

[an-tee-kwawrk, -kwahrk, an-tahy-]
noun Physics.
the antiparticle of a quark.

Origin:
anti- + quark

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
antiquark (ˈæntɪkwɑːk) [Click for IPA pronunciation guide]
 
n
the antiparticle of a quark

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Antiquark is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
American Heritage
Science Dictionary
antiquark   (ān'tē-kwôrk', ān'tī-)  Pronunciation Key 
The antiparticle that corresponds to a quark.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Every quark in this matter would have a symmetric antiquark to balance it.
Physicists concluded that the upsilon was made of a new quark, the bottom quark, and its antiquark.
Strange quark-antiquark pairs are constantly bubbling up in the proton.
The high energy density produced quark-antiquark electron-positron, and other
  particle-antiparticle pairs.
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