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calomel

(kal′ə mel′, -məl)

noun

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: ModL calomel, calomeles < Gr kalos, beautiful + melas, black: see melano-

See calomel in American Heritage Dictionary 4

noun

A colorless, white or brown tasteless compound, Hg₂Cl₂, used as a purgative and insecticide. Also called mercurous chloride.

Origin:

Origin: Probably from New Latin calomelās

Origin: : Greek kalos, beautiful

Origin: + melās, black

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