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mercuric oxide

noun, Chemistry
a slightly crystalline, water-soluble, poisonous compound, HgO, occurring as a coarse, orange-red powder (red mercuric oxide) or as a fine, orange-yellow powder (yellow mercuric oxide) used chiefly as a pigment in paints and as an antiseptic in pharmaceuticals. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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mercuric oxide

a soluble poisonous substance existing in red and yellow powdered forms: used as pigments. Formula: HgO Systematic name mercury(II) oxide
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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