[fawr-uh-klok, fohr-] 
| 1. | a common garden plant, Mirabilis jalapa, of the four-o'clock family, having tubular red, white, yellow, or variegated flowers that open late in the afternoon. |
| 2. | any plant of the same genus. |
| four-o'clock (fôr'ə-klŏk', fōr'-) n. Any of several plants of the genus Mirabilis, especially M. jalapa, native to tropical America and widely cultivated for its funnel-shaped or tubular, variously colored flowers that open late in the afternoon. |