(n.) 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.
FOUR-O'CLOCK
Meaning of FOUR-O'CLOCK in English
Webster's English dictionary. Английский словарь Webster. 2012