. n. (Bot.) A common garden plant (Mirabilis jalapa or Mirabilis uniflora) of North America having fragrant red or purple or yellow or white flowers that open in late afternoon; called also four-o'clock. See four-o'clock.
Syn. -- common four-o'clock, marvel of Peru, Mirabilis jalapa, Mirabilis uniflora. [ WordNet 1.5 ]