[ noo-klee-on, nyoo- ]
/ ˈnu kliˌɒn, ˈnyu- /

noun Physics.

a proton or neutron, especially when considered as a component of a nucleus.

Nearby words

  1. nucleolated,
  2. nucleoliform,
  3. nucleoloid,
  4. nucleolonema,
  5. nucleolus,
  6. nucleon number,
  7. nucleonics,
  8. nucleopetal,
  9. nucleophile,
  10. nucleophilic

Origin of nucleon

First recorded in 1935–40; nucle(us) + -on1

Related formsnu·cle·on·ic, adjectivein·ter·nu·cle·on, adjectivein·ter·nu·cle·on·ic, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for nucleonic

  • Long ago, it was realized that the nucleonic particles—protons, neutrons, mesons and so on—must have structure of their own.

    The Answer|Henry Beam Piper
  • Since we started constructing negative-proton matter, we've found out a few things about nucleonic structure.

    The Answer|Henry Beam Piper

British Dictionary definitions for nucleonic


/ (ˈnjuːklɪˌɒn) /


a proton or neutron, esp one present in an atomic nucleus

Word Origin for nucleon

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

Medicine definitions for nucleonic


[ nōōklē-ŏn′ ]


A proton or neutron, especially as part of an atomic nucleus.
Related formsnu′cle•onic adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for nucleonic


[ nōōklē-ŏn′ ]

A proton or a neutron, especially as part of an atomic nucleus.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.