Nightshade \Night"shade`\, n. [AS. nichtscadu.]

(Bot.) A common name of many species of the genus Solanum, given esp. to the Solanum nigrum, or black nightshade, a low, branching weed with small white flowers and black berries reputed to be poisonous.

Deadly nightshade. Same as Belladonna
   (a) .

Enchanter's nightshade. See under Enchanter.

Stinking nightshade. See Henbane.

Three-leaved nightshade. See Trillium.

Source: Webster's Revised Unabridged Dictionary (1913)