We found 2 dictionaries that define the word four o'clock flower:

General (2 matching dictionaries)

1. four-o'clock flower, four o'clock flower: Wiktionary
2. Four o'clock flower: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (Four o'clock flower) ▸ noun:  Alternative form of four-o'clock flower ▸ 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