antiquark

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

Origin:
anti- + quark

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World English Dictionary
antiquark (ˈæntɪkwɑːk)
 
n
the antiparticle of a quark

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
Pull them apart and you pump enough energy into the system to make
  quark-antiquark pairs.
There are also hadrons called mesons, which are made of quark-antiquark pairs,
  an example of which is the pion.
Strange quark-antiquark pairs are constantly bubbling up in the proton.
Hadrons are not coupled directly to the muon, but a virtual photon in the soup
  can produce a virtual quark-antiquark pair.
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