/ Dictionary / Index R raob: Meaning and Definition of Find definitions for: ra•ob Pronunciation: (rā'ob), [key] — n. a radiosonde or rawinsonde observation. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ranunculaceous Raoult's law Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language