mercurous chloride, HgCl, a white, tasteless powder that darkens on exposure to light: used in standard electrode cells and as a fungicide, insecticide, etc.
Origin of calomelModern Latin calomel, calomeles ; from Classical Greek kalos, beautiful + melas, black: see melano-
A white or brown tasteless powder, Hg2Cl2, used as an insecticide and formerly as a purgative. Also called mercurous chloride.
Origin of calomelProbably from New Latin calomelās : Greek kalos, beautiful + melās, black.
- (inorganic chemistry) mercurous chloride Hg2Cl2
From French calomel.