/ Dictionary / Index D Dirac: Meaning and Definition of Find definitions for: Di•rac Pronunciation: (di-rak'), [key] — n. 1902–84, British physicist, in the U.S. after 1971: Nobel prize 1933. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dirac (Thesaurus) dir. Dirac delta function Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language