[al-vee-uh-lar-is] /ælˌvi əˈlær ɪs/ (Show IPA), Riggs' disease. Dentistry. a chronic form of periodontitis occurring in various degrees of severity, characterized in its severe forms by the formation of pus in the pockets between the roots of the teeth and their surrounding tissues, and frequently accompanied by the loosening and subsequent loss of the teeth.
Origin of pyorrhea
From New Latin, dating back to 1805-15; See origin at pyo-, -rhea