hyoscyamine

noun1

1. •
   A poisonous alkaloid present in henbane that is the stereoisomer of atropine, with similar properties to hyoscine, and used medicinally to treat abdominal pain and similar conditions.

   • If only Creake was going to poison his wife with hyoscyamine and bury her, instead of blowing her up with a dynamite cartridge and claiming that it came in among the coal. — 1914