/ Dictionary / Index O Ostiak: Meaning and Definition of Find definitions for: Os•ti•ak Pronunciation: (os'tē-ak"), [key] — n. Ostyak. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ostia ostiary Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language