/ Dictionary / Index O osmiridium: Meaning and Definition of Find definitions for: os•mi•rid•i•um Pronunciation: (oz"mu-rid'ē-um), [key] — n. Chem. iridosmine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: osmiridium (Thesaurus) osmious osmium Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language