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The 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]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PBO Process Before Output (R/3)