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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. The mineral form of lead monoxide, PbO.
  2. n. A yellow powder, PbO, used as a pigment.

Century Dictionary and Cyclopedia

  1. n. Protoxid of lead, or yellow oxid of lead, PbO. Melted lead exposed to the air becomes covered with a yellowish-gray dusky pellicle. This pellicle is carefully taken off, and is oxidized by exposure to air and a moderate heat to a greenish-gray powder, inclining to yellow. This oxid, separated from the grains of lead by sifting, and exposed to a heat sufficient to make it red-hot, but not to melt it, assumes a deep-yellow color. In this state it is called massicot, but does not differ chemically from litharge, though different in color and mechanical condition. After melting it has a reddish tint, and is called litharge. Massicot, slowly heated by a moderate fire, is further oxidized to minium or red lead. It is sometimes used as a pigment, and as a drier in the composition of ointments and plasters. Also called lead-ocher.

Wiktionary

  1. n. chemistry 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.

GNU Webster's 1913

  1. 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.

WordNet 3.0

  1. n. the mineral form of lead monoxide; in the form of yellow powder it is used as a pigment

Etymologies

  1. French massicot; English masticot is a corruption (Wiktionary)
  2. Middle English masticot, from Old French, perhaps from Old Italian marzacotto, potter's glaze (perhaps from Spanish mazacote, mortar), possibly from Arabic masḥaqūnīyā, perhaps of Greek origin. (American Heritage® Dictionary of the English Language, Fourth Edition)

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