bel·la·don·na noun \ˌbel-ə-ˈdän-ə\
: an Old World poisonous plant of the genus Atropa (A. belladonna) having purple or green flowers, glossy black berries, and a root and leaves that yield atropine—called also deadly nightshade
: a medicinal preparation (as atropine) extracted from the belladonna plant and containing anticholinergic alkaloids
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