1 four-o\'clock | Definition of four-o\'clock
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four-o'clock

noun
\ ˈfȯr-ə-ˌkläk How to pronounce four-o'clock (audio) \

Definition of four-o'clock

: 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, in the meaning defined above

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Rhyming Dictionary: Words that rhyme with four-o'clock

Britannica.com: Encyclopedia article about four-o'clock

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