Merriam-Webster Collegiate Dictionary - hyoscyamine

 noun  Etymology: German Hyoscyamin, from New Latin Hyoscyamus, genus of herbs, from Latin, henbane, from Greek hyoskyamos, literally, swine's bean, from hyos (genitive of hys swine) + kyamos bean — more at sow  Date: 1858 a poisonous crystalline alkaloid C17H23NO3 of which atropine is a racemic mixture; especially its levorotatory form found especially in the plants belladonna and henbane and used similarly to atropine