1. (

• belladonna ,
• belladonna_plant ,
• deadly_nightshade ,
• Atropa_belladonna

) perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine ;

2. (

• belladonna

) an alkaloidal extract or tincture of the poisonous belladonna plant that is used medicinally ;