/ Dictionary / Index O osteoblast: Meaning and Definition of Find definitions for: os•te•o•blast Pronunciation: (os'tē-u-blast"), [key] — n. Anat. a bone-forming cell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: osteoblast (Thesaurus) osteoarthrosis osteochondritis 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