crystalline alkaloid, 1896, from Ger. mezcalin (1896), so called because it originally was found in the buttons that grow atop the mescal cacti (see mescal).
Main Entry: mes·ca·line Pronunciation: 'mes-k&-l&n, -"lEn Function: noun : a hallucinatory crystalline alkaloidC11H17NO3 that is the chief active principle in mescal buttons
mescaline mes·ca·line (měs'kə-lēn', -lĭn) n. An alkaloid drug obtained from buttons of a small cactus (Lophophora williamsii) that has hallucinatory effects.