galena

1. (mineralogy) A mineral, lead sulphide (PbS), mined as an ore for lead.Examples: "You can easily extract lead from galena, a natural mineral which has been used in crystal radio receivers."; "1942, G. F. Loughlin, A. H. Koschmann, Geology and Ore Deposits of the Magdalena Mining District, New Mexico, Geological Survey Professional Paper, Issue 200, page 98, The galena of the ore contains microscopic inclusions of various forms that become visible upon polished surfaces etched with hydrochloric or nitric acid."; "These samples had higher Pb²⁰⁶ and Pb²⁰⁸ abundances than any other galenas yet examined."uncountableusually

2. (medicine, obsolete) A remedy or antidote for poison; theriacobsoleteuncountableusually