lead protoxide

1 definition found

lead protoxide - Collaborative International Dictionary of English v.0.48 :

  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]