litharge
Concise Oxford English Dictionary © 2008 Oxford University Press:
litharge /ˈlɪθɑːdʒ/
▶noun lead monoxide, especially a red form used as a pigment in glass and ceramics.
– origin ME: from OFr. litarge, via L. from Gk litharguros, from lithos ‘stone’ + arguros ‘silver’.
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