Definition from Wiktionary, the free dictionary
nightshade (plural nightshades)
- (botany) Any of the poisonous plants belonging to the genus Solanum, especially black nightshade or woody nightshade.
- (botany, colloquial) Any plant of the wider Solanaceae family, including the nightshades as well as tomato, potato, eggplant, and deadly nightshade.
- Belladonna or deadly nightshade, Atropa belladonna.
- Any of several plants likened to nightshade, usually because of similar dark-colored berries.
plant of genus Solanum
deadly nightshade — see deadly nightshade