Literally meaning: “around the tooth”
Origin: Anc Greek
περί-/peri- (=combining form meaning “around”)
++οδούς/odous(=tooth) > (in the genitive) οδόντος/odontos(= of tooth)
+-um=latin suffix that forms singular nouns
Periodontium is tissue that surround and support the teeth, including the, periodontal ligament, gums cementum, and alveolar and supporting bone.