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

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]