/ Dictionary / Index O Osasco: Meaning and Definition of Find definitions for: O•sas•co Pronunciation: (oo-säs'koo), [key] — n. a city in SE Brazil, NW of São Paulo. 376,689. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: osasco (Thesaurus) osar O.S.B. Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language