Xǔ Yùhé 許豫和 (hào Xiàngcūn 橡村 / Yítáng 怡堂, 1724–1805 by standard biographical reference), Qīng-period Xīnān 新安 (Huīzhōu / Anhui) physician of the late Qiánlóng — early Jiāqìng period. Major figure of the late-eighteenth-century Xīn-ān-school regional-medical tradition. Principal medical specialty was paediatrics (especially smallpox) but moved beyond the specialty into broader clinical-theoretical synthesis in his later years. Major works: Xiàngcūn dòujué 橡村痘訣 (smallpox), Yítáng sànjì 怡堂散記 (KR3eq063) with Doutiao Yuyi 痘訣余議 supplement. Not in CBDB.