/ Dictionary / Index A antiquark: Meaning and Definition of Find definitions for: an•ti•quark Pronunciation: (an'tē-kwôrk", -kwärk", an'tī-), [key] — n. Physics. the antiparticle of a quark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antiquark (Thesaurus) antiquarian antiquary Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language