/ Dictionary / Index D down quark: Meaning and Definition of Find definitions for: down' quark" Pronunciation: [key] — Physics. Physics. the quark having electric charge − times the elementary charge, with strangeness, charm, and other quark quantum numbers equal to 0. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. downpour downrange Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language