We found 19 dictionaries that define the word birdbrain:

General (16 matching dictionaries)

1. birdbrain: Merriam-Webster
2. birdbrain: Oxford Learner's Dictionaries
3. birdbrain: American Heritage Dictionary of the English Language
4. birdbrain: Vocabulary.com
5. birdbrain: Wordnik
6. birdbrain: Cambridge Advanced Learner's Dictionary
7. birdbrain: Wiktionary
8. birdbrain: Webster's New World College Dictionary, 4th Ed.
9. birdbrain: Infoplease Dictionary
10. birdbrain: Dictionary.com
11. Birdbrain (album), Birdbrain (band), Birdbrain: Wikipedia, the Free Encyclopedia
12. birdbrain: Rhymezone
13. birdbrain: FreeDictionary.org
14. birdbrain: Mnemonic Dictionary
15. birdbrain: TheFreeDictionary.com
16. birdbrain: Wikimedia Commons US English Pronunciations

Art (1 matching dictionary)

17. Jazz Humor (No longer online)

Business (1 matching dictionary)

18. birdbrain: Legal dictionary

Computing (1 matching dictionary)

19. birdbrain: Encyclopedia

(Note: See birdbrained as well.)

Definitions from Wiktionary (birdbrain) ▸ noun:  (colloquial) Someone who is not intelligent. Similar: loon, addle-head, beanbrain, shitbrain, brain, bubble brain, der-brain, addle-brain, bird brain, lackbrain, more... Opposite: intelligent, smart, brilliant, genius ▸ Words similar to birdbrain ▸ Usage examples for birdbrain ▸ Idioms related to birdbrain ▸ Wikipedia articles (New!) ▸ Popular adjectives describing birdbrain ▸ Words that often appear near birdbrain ▸ Rhymes of birdbrain ▸ Invented words related to birdbrain