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The Collaborative International Dictionary of English v.0.48 (gcide)

Litharge \Lith"arge\ (l[i^]th"[.a]rj), 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]


massicot \mas"si*cot\, 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}.
[1913 Webster PJC]

Note: Massicot is sometimes used by painters, and also as a
drier in the composition of ointments and plasters.
[1913 Webster]

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