We found 3 dictionaries that define the word half-an-hour:

General (2 matching dictionaries)

1. half-an-hour, half-an-hour: Collins English Dictionary
2. half-an-hour: Wiktionary

Slang (1 matching dictionary)

3. half-an-hour: Green’s Dictionary of Slang

Definitions from Wiktionary (Half-an-hour) ▸ noun:  Alternative form of half an hour. [Thirty minutes.] ▸ Words similar to half-an-hour ▸ Usage examples for half-an-hour ▸ Idioms related to half-an-hour ▸ Wikipedia articles (New!) ▸ Popular adjectives describing half-an-hour ▸ Words that often appear near half-an-hour ▸ Rhymes of half-an-hour ▸ Invented words related to half-an-hour