/ Dictionary / Index E endostosis: Meaning and Definition of Find definitions for: en•dos•to•sis Pronunciation: (en"do-stō'sis, -du-), [key] — n. Anat. bone formation beginning in the substance of cartilage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. endosteum endostyle Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language