gluon

[gloo-on]
noun Physics.
an unobserved massless particle with spin 1 that is believed to transmit the strong force between quarks, binding them together into baryons and mesons.

Origin:
1970–75; glue + -on1

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Collins
World English Dictionary
gluon (ˈɡluːɒn)
 
n
a hypothetical particle believed to be exchanged between quarks in order to bind them together to form particles
 
[C20: from glue + -on]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
gluon   (gl'ŏn)  Pronunciation Key 
The subatomic particle that mediates the strong force. The exchange of gluons between two quarks changes the color of the quarks and results in the attractive force holding them together in hadrons. Gluons are bosons. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

gluon

the so-called messenger particle of the strong nuclear force, which binds subatomic particles known as quarks within the protons and neutrons of stable matter as well as within heavier, short-lived particles created at high energies. Quarks interact by emitting and absorbing gluons, just as electrically charged particles interact through the emission and absorption of photons.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Particle collisions hint at existence of undiscovered gluon.
The second important reason to study photons at a hadron collider is to measure the gluon distribution inside the proton.
Scientists have always known that to calculate the position of every meson and gluon would be impossible, so they cheated.
At low transverse momentum, multiple soft gluon emission is expected to dominate the cross section.
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