n. [ OE. litarge, F. litharge, L. lithargyrus, Gr. liqa`rgyros the scum or foam of silver; li`qos stone + 'a`rgyros 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. [ 1913 Webster ]