four-o'clock
noun
: 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
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Merriam-Webster unabridged
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