Main Entry: four–o'clock

Pronunciation: \ˈfȯr-ə-ˌkläk\

Function: noun

Date: 1756

: 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