the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment
lead monoxide, 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; also, lead oxide yellow, as opposed to red lead, which is lead tetroxide Pb₃O₄.
The word comes from the French term massicot. The original English spelling, masticot, was a corrupted version of this foreign loanword.