Imamura Ryōan 今村了庵 / 今邨亮 (1814–1890; imina Tōshi 亮 / Liàng, zì Yúfǔ 與甫, hào Ryōan 了庵), late-Edo and early-Meiji Japanese kanpō 漢方 physician of Higo 肥後 origin and Edo practice, third generation of a hereditary medical family. Senior shogunal physician (oku-i 奧醫師) under the late Tokugawa bakufu; close associate of Asada Sōhaku 淺田惟常. After the 1868 Restoration he served briefly on the imperial medical staff before retiring to private practice. Principal work is KR3eh055 Kakke kōyō 腳氣鉤要 (1861), the most theoretically coherent late-Edo monograph on beriberi (kakke 脚気), which articulates the suǐdoku 水毒 (“water-poison”) doctrine of the disease — a thesis taken up by the subsequent Hakusaidō school (cf. KR3eh054). Other works include Iji manpitsu 醫事漫筆 and Kō chū iji keigen 攷註醫事啟源. The orthographic variants 邨 / 村 are interchangeable.