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. 2014.
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World English Dictionary
mercuric oxide
Systematic name: mercury(II) oxide a soluble poisonous substance existing in red and yellow powdered forms: used as pigments. Formula: HgO

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Explosion of mercuric oxide may occur with friction or application of heat.
Mercuric oxide button cells once were widely used in hearing aids but now are prohibited under federal law.
The two exceptions are mercuric oxide batteries and button cell batteries.
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