noun. an alkaloidal extract or tincture of the poisonous belladonna plant that is used medicinally.
noun. perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine.
1. Noun, singular or mass Amaryllis belladonna is also easy to grow. 2. Adjective Also native to South Africa but best in a gritty soil, belladonna lily (Amaryllis belladonna) is seasonally dormant, lacking foliage in the few months before the naked flower stems poke up from the soil.