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
antispasmodic: a drug used to relieve or prevent spasms (especially of the smooth muscles)
california white oak: tall graceful deciduous California oak having leathery leaves and slender pointed acorns