/ Dictionary / Index P periodontist: Meaning and Definition of Find definitions for: per•i•o•don•tist Pronunciation: (per"ē-u-don'tist), [key] — n. a specialist in periodontics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: periodontist (Thesaurus) periodontics periodontitis Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language