Noun
A plant of the genus Mirabilis. There are about half a dozen species, natives of the warmer parts of America. The common four-o'clock is M. Jalapa. Its flowers are white, yellow, and red, and open toward sunset, or earlier in cloudy weather; hence the name. It is also called marvel of Peru, and afternoon lady.
The friar bird; -- so called from its cry, which resembles these words.
Source: Webster's dictionaryfour o'clock
At four o'clock in the afternoon, Nicholas and his daughters took their usual walk in the small garden. Source: Internet
The light beams turned skyward first appeared shortly after four o'clock, the hour when the attack had started 25 years earlier. citation. Source: Internet
Non-Mendelian inheritance In four o'clock plants, the alleles for red and white flowers show incomplete dominance. Source: Internet