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WordReference Random House Unabridged Dictionary of American English © 2024per•i•o•don•ti•tis (per′ē ō don tī′tis),USA pronunciation n. [Dentistry.]- Dentistryinflammation of the periodontium caused by bacteria that infect the roots of teeth and the surrounding gum crevices, producing bleeding, pus formation, and gradual loss of bone and the tissues that support the teeth. Cf. pyorrhea (def. 2).
- periodont(ium) + -itis 1870–75
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