The Collaborative International Dictionary
Lithargyrum
Lithargyrum \Li*thar"gy*rum\ (l[i^]*th[aum]r"j[i^]*r[u^]m), n. [NL. See Litharge.] (Old Chem.) Crystallized litharge, obtained by fusion in the form of fine yellow scales.
Wiktionary
lithargyrum
n. (context chemistry archaic English) crystallized litharge, obtained by fusion in the form of fine yellow scales