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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] Deadly nightshade. Same as Belladonna (a) . Enchanter's nightshade. See under Enchanter. Stinking nightshade. See Henbane. Three-leaved nightshade. See Trillium. [1913 Webster]