/ Dictionary / Index O OSRD: Meaning and Definition of Find definitions for: OSRD Pronunciation: [key] Office of Scientific Research and Development. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. osprey OSS Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language