narceine
/ˈnɑːsɪɪn/Chemistry
noun
A narcotic tricyclic crystalline alkaloid, C23H27NO8, obtained from opium or narcotine and formerly used as a painkiller.
Origin
Mid 19th century; earliest use found in Reports of the British Association for the Advancement of Science. From French narcéine from ancient Greek νάρκη numbness + French -ine.