n.
Pronunciation: ˌ h ī - ə - ' s ī - ə - ˌ m ē n
Function: noun
Etymology: German Hyoscyamin, from New Latin Hyoscyamus, genus of herbs, from Latin, henbane, from Greek hyoskyamos, literally, swine's bean, from hyos (gen. of hys swine) + kyamos bean ― more at SOW
Date: 1858
: a poisonous crystalline alkaloid C 17 H 23 NO 3 of which atropine is a racemic mixture especially : its levorotatory form found especially in the plants belladonna and henbane and used similarly to atropine