We found 6 dictionaries that define the word loony bins:

General (6 matching dictionaries)

1. loony bins: Merriam-Webster
2. loony bins: Collins English Dictionary
3. loony bins: Vocabulary.com
4. loony bins: Cambridge Advanced Learner's Dictionary
5. loony bins: Wiktionary
6. loony bins: TheFreeDictionary.com

(Note: See loony_bin as well.)

Definitions from Wiktionary (loony bin) ▸ noun:  (slang, derogatory) A lunatic asylum. ▸ Also see loony_bin ▸ Words similar to loony bins ▸ Usage examples for loony bins ▸ Idioms related to loony bins ▸ Wikipedia articles (New!) ▸ Words that often appear near loony bins ▸ Rhymes of loony bins ▸ Invented words related to loony bins