Lead monoxide, especially a red form used as a pigment and in glass and ceramics.
Chemical formula: PbO‘The ore, which ran to 25 percent silver, was melted in a small clay or stone furnace called a guaira or wayra, using lead oxide (litharge) as a flux.’
- ‘Fluxing agents include lead oxide or litharge which is used as a collector of precious metals.’
Middle English from Old French litarge, via Latin from Greek litharguros, from lithos ‘stone’ + arguros ‘silver’.
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