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Definition of: nyctaginaceous
(nik′tə·ji·nā′shəs) adjective Bot.
Of or pertaining to a family of plants (Nyctaginaceae) widely distributed in warm and tropical lands, including the bougainvillea; the four–o'–clock family. [<NL <Nyctago, -inis, former genus name <Gk. nyx, nyktos night]
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