nightshade Definition

any of a genus (Solanum of the family Solanaceae, the nightshade family) of herbs, shrubs, and trees having alternate leaves, cymose flowers, and fruits that are berries and including some poisonous weeds, various ornamentals, and important crop plants (such as the potato and eggplant)

belladonna

belladonna

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