top quark

noun Physics.
a heavy quark having electric charge 2/3 times the elementary charge.
Also called t quark, truth quark.

1975–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
top quark   (tŏp)  Pronunciation Key 
A quark with a charge of +2/3. Its mass is larger than that of all the other quarks and is about 360,000 times that of the electron. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In this it will resemble the top quark, the latest fundamental particle to have
  been detected.
One, which has been around for a while but doesn't seem to be going away, is a
  forward-backward asymmetry in top quark production.
The top quark's lifetime is another interesting feature.
Since the discovery of the top quark, physicists have been scrutinizing every
  detail of this heavyweight particle.
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