/ Dictionary / Index P parton: Meaning and Definition of Find definitions for: par•ton Pronunciation: (pär'ton), [key] — n. Physics. a constituent of the nucleon originally postulated in the theoretical analysis of high-energy scattering of electrons by nucleons and subsequently identified with quarks and gluons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. part of speech partook Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language