Lóng Duìshān 龍兌山, late-Qīng / early-Republican Hénán physician, the orphaned grandson of 龍繪堂 Lóng Huìtáng and the named addressee of KR3eq093 Chǔnzǐ yī 蠢子醫. Per the 1914 postface, he and his uncle Jūnyóu 君由 established their clinical reputations on the basis of the verse-mnemonic Chǔnzǐ yī, and Duìshān provided oral explanations of obscure passages that the Republican-era editors recorded as marginal notes. No standard biographical record located.