Definition of periodontitis noun from the Oxford Advanced American Dictionary

 

periodontitis

 noun
noun
NAmE//ˌpɛrioʊdɑnˈtaɪt̮əs//
 
(also pyorrhea)[uncountable](medical)
 
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a condition in which the area around the teeth becomes sore and swollen, which may make the teeth fall out
See the Oxford Advanced Learner's Dictionary entry: periodontitis