[noo-klee-on, nyoo-]
noun Physics.
a proton or neutron, especially when considered as a component of a nucleus.

1935–40; nucle(us) + -on1

nucleonic, adjective
internucleon, adjective
internucleonic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nucleon (ˈnjuːklɪˌɒn)
a proton or neutron, esp one present in an atomic nucleus
[C20: from nucle(us) + -on]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

nucleon nu·cle·on (nōō'klē-ŏn', nyōō'-)
A proton or a neutron, especially as part of an atomic nucleus.

nu'cle·on'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nucleon   (n'klē-ŏn')  Pronunciation Key 
A proton or a neutron, especially as part of an atomic nucleus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


either of the subatomic particles, the proton and the neutron, constituting atomic nuclei. Protons (positively charged) and neutrons (uncharged) behave identically under the influence of the short-range nuclear force, both in the way they are bound in nuclei and in the way they are scattered by each other. This strong interaction is independent of electric charge. Unstable subatomic particles heavier than nucleons (hyperons and baryon resonances) have a nucleon among their final decay products; the nucleon is thus the baryon ground state. The antinucleons include the antiproton and the antineutron.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Injecting nucleon decay electrons and positrons into a rotating dark energy
  star will result in a highly collimated lepton jet.
The reason they both release energy can be understood by examining a curve
  called the binding energy per nucleon curve.
The ultimate goal will be to describe all possible interactions every nucleon
  can have with every other nucleon.
The resonance is shifted and broadened compared to the reaction on a free
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