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four-o'clock
adjective
designating a family (Nyctaginaceae, order Caryophyllales) of dicotyledonous plants, including the bougainvilleas
noun
any of a genus (Mirabilis) of chiefly tropical American plants of the four-o'clock family, bearing petal-less flowers and, often, brightly colored leaves; esp., a garden plant (M. jalapa) with long-tubed blossoms that generally open at about 4:00
See four-o'clock in American Heritage Dictionary 4
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