/ Dictionary / Index O ostensorium: Meaning and Definition of Find definitions for: os•ten•so•ri•um Pronunciation: (os"tun-sôr'ē-um, -sōr'-), [key] — pl. -so•ri•a ostensory. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ostensorium (Thesaurus) ostensive definition ostensory Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language