/ Dictionary / Index O osteo-: Meaning and Definition of Find definitions for: osteo- Pronunciation: [key] a combining form meaning “bone,” used in the formation of compound words: osteometry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ostentatious osteoarthritis Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language