/ Dictionary / Index H hadron: Meaning and Definition of Find definitions for: had•ron Pronunciation: (had'ron), [key] — n. Physics. any elementary particle that is subject to the strong interaction. Hadrons are subdivided into baryons and mesons. Cf. quark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hadron (Thesaurus) Hadrian's Wall hadrosaur Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language