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periodontitis

noun
/ˌperiədɒnˈtaɪtɪs/
/ˌperiədɑːnˈtaɪtɪs/
(British English also pyorrhoea)
(North American English also pyorrhea)
[uncountable] (medical医学)
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  1. a condition in which the area around the teeth becomes painful and swollen (= larger than normal), which may make the teeth fall out牙周炎

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