Entry 1 sense Webster, 1913 Hydrargyrism /(hī̇*drär"jĭ*rĭz'm)/ · Hy·drar·gy·rism · IPA 01 n. A diseased condition produced by poisoning with hydrargyrum, or mercury; mercurialism. 1. A diseased condition produced by poisoning with hydrargyrum, or mercury; mercurialism.(Med.)