Definition of: nightshade

(nīt′shād) noun
1. Any one of a genus (Solanum) of flowering plants; especially, the common or black nightshade (S. nigrum), a weedlike plant with white flowers and black berries, reputed poisonous, but used medicinally, and the climbing or woody nightshade (S. dulcamara).
2. The belladonna or deadly nightshade.
3. The henbane.
—enchanter's nightshade A low, inconspicuous herb (genus Circaea) growing in damp woods.
BLACK NIGHTSHADE
a. Spray showing blossom (b) and fruit (c).