noun \ˈfȯr-ə-ˌkläk\

Definition of four–o'clock

  1. :  any of a genus (Mirabilis) of chiefly American annual or perennial herbs (family Nyctaginaceae, the four-o'clock family) having apetalous flowers with a showy involucre simulating a calyx; especially :  a garden plant (M. jalapa) with fragrant yellow, red, or white flowers opening late in the afternoon


First Known Use of four–o'clock


Learn More about four–o'clock

Seen and Heard

What made you want to look up four–o'clock? Please tell us where you read or heard it (including the quote, if possible).