four–o'clock

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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

1756

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sad or melancholy

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