/ Dictionary / Index O Osorno: Meaning and Definition of Find definitions for: O•sor•no Pronunciation: (ô-sôr'nô), [key] — n. a city in S Chile. 78,187. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. OSO OSP Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language