pyorrhoea
noun (British English)(North American English pyorrhea)
(also periodontitis British and North American English)
[uncountable] (a condition in which the area around the teeth becomes painful and swollen (= larger than normal), which may make the teeth fall out 脓胸：牙齿周围区域疼痛和肿胀的状况，可能使牙齿脱落 Word Originearly 19th cent.: from Greek puo- (from puon ‘pus’) + rhoia ‘flux’ (from rhein ‘to flow’).