noun plural but singular or plural in construction see: tooth Date: circa 1944 a branch of dentistry that deals with diseases of the supporting and investing structures of the teeth including the gums, cementum, periodontal membranes, and alveolar bone, periodontist noun
PERIODONTICS
Meaning of PERIODONTICS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012