mercuric oxide

noun

Medical Definition of mercuric oxide 

: either of two forms of a slightly water-soluble crystalline poisonous compound HgO:

a : a yellow finely divided powder obtained usually by precipitation from solutions of mercuric chloride and sodium hydroxide and used in antiseptic ointments

b : a bright red coarse powder obtained by precipitation from hot solutions or by heating a nitrate of mercury and used similarly to the yellow form

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