Calomel definitions

kăl'ə-mĕl', -məl
A white or brown tasteless powder, Hg2 Cl2 , used as an insecticide and formerly as a purgative.
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Mercurous chloride, HgCl, a white, tasteless powder that darkens on exposure to light: used in standard electrode cells and as a fungicide, insecticide, etc.
noun
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A white or brown tasteless powder, Hg2 Cl2 , used as an insecticide and formerly as a purgative.
noun
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(inorganic chemistry) Mercurous chloride Hg2Cl2
noun
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Origin of calomel

Probably from New Latin calomelās Greek kalos beautiful melās black