Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of the point particles believed to be a constituent of hadrons, now known as quarks. No longer in technical use.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the constituent particles making up a compound particle, i.e. the quarks and gluons which make up hadrons.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

part(icle) + -on1.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Coined by quantum field theorist Richard Feynmann in 1969 by part +‎ -on

Examples

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