/ Dictionary / Index O Oost: Meaning and Definition of Find definitions for: Oost Pronunciation: (ōst), [key] 1600?–71, and his son,1639?–1713, Flemish painters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oospore OOT Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language