/ Dictionary / Index R rad/s: Meaning and Definition of Find definitions for: rad/s Pronunciation: [key] radians per second. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rads (Thesaurus) radon radula Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language