1. perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine • Syn: belladonna plant, deadly nightshade, Atropa belladonna • Hypernyms: herb, herbaceous plant • Member Holonyms: Atropa, genus Atropa 2. an alkaloidal extract or tincture of the poisonous belladonna plant that is used medicinally • Hypernyms: atropine