/ Dictionary / Index R RDT&E: Meaning and Definition of Find definitions for: RDT&E Pronunciation: [key] research, development, testing, and engineering. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. RDS RDX Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language