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atropine (n.)

also atropin, "poisonous crystalline alkaloid obtained from nightshade," 1831, from Latin atropa "deadly nightshade" (from which the alkaloid poison is extracted), from Greek atropos "inflexible, unchangeable," also the name of one of the Fates (see Atropos) + chemical suffix -ine (2). By 1821 in French and German.

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Definitions of atropine from WordNet

atropine (n.)
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;
From wordnet.princeton.edu