periodontia
noun(peri-odon-tia)
the supporting structures of the teeth including the cementum, the periodontal ligament, the bone of the alveolar process, and the gums
periodontia
noun plural but singular or plural in construction(peri-odon-tia)
a branch of dentistry that deals with diseases of the supporting and investing structures of the teeth including the gums, cementum, periodontal ligaments, and alveolar bone —called also periodontia, periodontology