Webster’s Revised Unabridged Dictionary · 1913
Atropine
At′ro·pine (·pĭn), n. [Gr. ἄτροπος inflexible; hence ἡ, one of the three Parcæ; ἀ priv. + τρέπειν to turn.] (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.