We found one dictionary that defines the word four-o'clock flower:

General (1 matching dictionary)

1. four-o'clock flower: Wiktionary

Definitions from Wiktionary (Four-o'clock flower) ▸ noun:  Alternative form of four-o'clock ▸ Words similar to four-o'clock flower ▸ Usage examples for four-o'clock flower ▸ Idioms related to four-o'clock flower ▸ Wikipedia articles (New!) ▸ Words that often appear near four-o'clock flower ▸ Rhymes of four-o'clock flower ▸ Invented words related to four-o'clock flower