Webster's English Dictionary

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belladonna

bel.la.don.na \.bel-*-'da:n-*\ n [It, lit., beautiful lady] 1: a European 
   poisonous plant (Atropa belladonna) of the nightshade f amily having 
   reddish bell-shaped flowers, shining black berries, and root and leaves 
   that yield atropine - called also deadly nightshade 2: a medicinal extract 
   from the belladonna plant