/ Dictionary / Index O ostmark: Meaning and Definition of Find definitions for: ost•mark Pronunciation: (ôst'märk", ost'-), [key] — n. (formerly) a cupronickel coin and monetary unit of East Germany: replaced by the Deutsche mark in 1990. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ostler ostomy Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language