mercuric oxide

noun Chemistry.

1. 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.

noun

1. a soluble poisonous substance existing in red and yellow powdered forms: used as pigments. Formula: HgOSystematic name: mercury(II) oxide