/ Dictionary / Index O Oppenheimer: Meaning and Definition of Find definitions for: Op•pen•heim•er Pronunciation: (op'un-hī"mur), [key] 1904–67, U.S. nuclear physicist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oppenheimer (Thesaurus) Oppenheim oppidan Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language