/ Dictionary / Index O odontoblast: Meaning and Definition of Find definitions for: o•don•to•blast Pronunciation: (ō-don'tu-blast"), [key] — n. Anat. one of a layer of cells lining the pulp cavity of a tooth, from which dentin is formed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. odonto- odontocete Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language