Four-o'clock n.
 1. Bot. 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.
 2. Zool. The friar bird; -- so called from its cry, which resembles these words.
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