Dictionary  at•ro•pinePronunciation: (a'tru-pēn", -pin), [key] —n. Pharm. a poisonous crystalline alkaloid, C17H23NO3, obtained from belladonna and other plants of the nightshade family, that prevents the response of various body structures to certain types of nerve stimulation: used chiefly to relieve spasms, to lessen secretions, and, topically, to dilate the pupil of the eye. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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