/ Dictionary / Index O Ossining: Meaning and Definition of Find definitions for: Os•si•ning Pronunciation: (os'u-ning), [key] — n. a town in SE New York, on the Hudson: the site of a state prison formerly known as Sing Sing. 20,196. Formerly, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ossify ossobuco Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language