/ Dictionary / Index C cementum: Meaning and Definition of Find definitions for: ce•men•tum Pronunciation: (si-men'tum), [key] — n. Dentistry. the bonelike tissue that forms the outer surface of the root of the tooth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cementum (Thesaurus) cement steel cemeterial Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language