periodonticsPronunciation: /ˌpɛrɪəˈdɒntɪks/Definition of periodontics noun [treated as singular] the branch of dentistry concerned with the structures surrounding and supporting the teeth. Derivatives periodontal adjective periodontist noun Origin: 1940s: from peri- 'around' + Greek odous, odont- 'tooth' + -icsperiodontics in other Oxford dictionaries Definition of periodontics in the US English dictionary