belladonna Definition

an Old World poisonous plant (Atropa belladonna) of the nightshade family having purple or green bell-shaped flowers, glossy black berries, and root and leaves that yield atropine —called also deadly nightshade

a medicinal extract (such as atropine) from the belladonna plant

an autumn-flowering South African bulbous perennial herb (Amaryllis belladonna) that is typically grown in gardens for its clusters of large, fragrant, usually white or pink, trumpet-shaped flowers which resemble lilies and are borne on a long, solid, leafless stem : amaryllis