GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Litharge (lĭthˈȧrj), 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.
   
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2.       
   massicot (?), n. [F. massicot; E. masticot is a corruption.] (Chem.) Lead monoxide (also called Lead protoxide), PbO, obtained as a yellow amorphous powder, the fused and crystalline form of which is called litharge; lead ocher. It is used as a pigment.  It is also called lead oxide yellow, as opposed to red lead, which is lead tetroxide Pb3O4.
   
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   ☞ Massicot is sometimes used by painters, and also as a drier in the composition of ointments and plasters.
   
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