(mineralogy) A mineral, lead sulphide (PbS), mined as an ore for lead.
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.
(medicine, obsolete) A remedy or antidote for poison; theriac