WordReference Random House Unabridged Dictionary of American English © 2026
four′-o'clock fam′ily, 
  1. Plant Biologythe 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.

'four-o'clock family' also found in these entries (note: many are not synonyms or translations):
four-o'clock - nyctaginaceous

Forum discussions with the word(s) "four-o'clock family" in the title:


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