Litharge

Lith″arge (lĭth″ȧrj), n. [OE. litarge, F. litharge, L. lithargyrus, Gr. λιθάργυροσ the scum or foam of silver; λίθοσ stone + ἄργυροσ silver. Litharge is found in silverbearing lead ore.] (Chem.) Lead monoxide; a yellowish red substance, obtained as an amorphous powder, or crystallized in fine scales, by heating lead moderately in a current of air or by calcining lead nitrate or carbonate. It is used in making flint glass, in glazing earthenware, in making red lead or minium, etc. Called also massicot.