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[noo-klee-on, nyoo-] /ˈnu kliˌɒn, ˈnyu-/
noun, Physics.
a proton or neutron, especially when considered as a component of a nucleus.
Origin of nucleon
1935-40; nucle(us) + -on1
Related forms
nucleonic, adjective
internucleon, adjective
internucleonic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for nucleon
  • 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.
  • Interference effect in the scattering amplitudes for nucleon-induced two-step direct process using the sudden approximation.
  • 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 nucleon.
  • The use of high energy electron scattering as a means to probe the structure of the nucleon and nuclei.
British Dictionary definitions for nucleon


a proton or neutron, esp one present in an atomic nucleus
Word Origin
C20: from nucle(us) + -on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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nucleon in Medicine

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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nucleon in Science
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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