One of the mysteries of the English language finally explained.
- another term for periodontitis
- ‘One patient with a history of bowel irregularity was suffering from pyorrhea.’
- ‘In the past periodontal disease was known as pyorrhoea.’
Early 19th century: from Greek puo- (from puon ‘pus’) + rhoia ‘flux’ (from rhein ‘to flow’).
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