/ Dictionary / Index O ostler: Meaning and Definition of Find definitions for: ost•ler Pronunciation: (os'lur), [key] — n. hostler. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ostler (Thesaurus) ostium ostmark 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