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]
Massicot is sometimes used by painters, and also as a drier in the composition of ointments and plasters.
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Wed 12th December 2018