atropine Meaning, Definition & Usage

  1. noun 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

WordNet

At"ro*pine noun
Etymology
Gr. inflexible; hence , one of the three Parcæ; priv. + to turn.
Definitions
  1. (Chem.) A poisonous, white, crystallizable alkaloid, extracted from the Atropa belladonna, or deadly nightshade, and the Datura Stramonium, or thorn apple. It is remarkable for its power in dilating the pupil of the eye. Called also daturine.

Webster 1913