/ Dictionary / Index Q quantum electrodynamics: Meaning and Definition of Find definitions for: quan'tum electrodynam'ics Pronunciation: [key] — Physics. Physics. the quantum field theory that deals with the electromagnetic field and its interaction with electrons and positrons. Abbr.: QED Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quantum chromodynamics quantum field theory Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language