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four-o'clock family

noun
  1. the plant family Nyctaginaceae, characterized by chiefly tropical herbaceous plants and shrubs having colored, petallike bracts beneath petalless flowers and winged or grooved dry fruit, and including the bougainvillea and four-o'clock.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018