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From: Webster's Revised Unabridged Dictionary (1913)

 mas·si·cot n.  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.
 Note: ☞ Massicot is sometimes used by painters, and also as a drier in the composition of ointments and plasters.
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