Definition of four-o'clock in English:

four-o'clock

Syllabification: four-o'clock
Pronunciation: /ˌfôrəˈkläk
 
/

noun

A tropical American herbaceous plant with fragrant trumpet-shaped flowers that open late in the afternoon. Also called marvel of Peru.
  • Mirabilis jalapa, family Nyctaginaceae
More example sentences
  • But consider too the times of day that certain flowers will bloom; you can plant morning glories, four-o'clocks and night-blooming jasmine together for a garden that will bloom from dawn past dusk.
  • Love-in-a mist, four-o'clock, cosmos, nasturtium, globe amaranth, balsam, and larkspur are a few I remember from childhood.
  • Less conspicuous species are woolly plantain, wild four-o'clock, yellow stargrass, and false toadflax.

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