atropine: a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides
chemical: material produced by or used in a reaction involving changes in atoms or molecules
roystonea: a monocotyledonous genus of West Indian feather palms