PYORRHOEA Meaning of PYORRHOEA in English n. (US pyorrhea) 1. a disease of periodontal tissue causing shrinkage of the gums and loosening of the teeth. 2 any discharge of pus. Etymology: Gk puo- f. puon pus + rhoia flux f. rheo flow Oxford English vocab. Оксфордский английский словарь. 2012