Four-o'clock Definition

fôrə-klŏk
noun
Any of a genus (Mirabilis) of chiefly tropical American plants of the four-o'clock family, bearing petal-less flowers and, often, brightly colored leaves; esp., a garden plant (M. jalapa) with long-tubed blossoms that generally open in the late afternoonp.m.
Webster's New World

The friarbird; so called from its cry, which resembles these words.

Wiktionary

The start of the fifth hour of the day in both the 12-hour and the 24-hour clock; 4:00.

Wiktionary
adjective
Designating a family (Nyctaginaceae, order Caryophyllales) of dicotyledonous plants, including the bougainvilleas.
Webster's New World

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