We found 25 dictionaries that define the word blue sky:

General (19 matching dictionaries)

1. blue-sky: Merriam-Webster
2. blue-sky, blue-sky: Oxford Learner's Dictionaries
3. blue-sky: American Heritage Dictionary of the English Language
4. blue-sky, blue-sky: Collins English Dictionary
5. blue-sky, blue sky: Vocabulary.com
6. blue-sky: Wordnik
7. blue-sky: Cambridge Advanced Learner's Dictionary
8. blue-sky, blue sky: Wiktionary
9. blue-sky: Webster's New World College Dictionary, 4th Ed.
10. blue-sky: Infoplease Dictionary
11. blue-sky, blue sky: Dictionary.com
12. Blue Sky (TV channel), Blue Sky (artist), Blue Sky (film), Blue Sky (navigation pod), Blue Sky (song), Blue Sky, Blue sky: Wikipedia, the Free Encyclopedia
13. blue sky: Rhymezone
14. blue-sky, blue sky: FreeDictionary.org
15. blue-sky, blue sky: Mnemonic Dictionary
16. blue-sky, blue sky: TheFreeDictionary.com
17. blue sky: Longman Dictionary of Contemporary English

Business (2 matching dictionaries)

18. MoneyGlossary.com (No longer online)
19. Glossary of Legal Terms (No longer online)

Computing (1 matching dictionary)

20. blue sky: Encyclopedia

Slang (2 matching dictionaries)

21. blue sky, blue sky, blue sky, blue sky: Green’s Dictionary of Slang
22. blue sky: Urban Dictionary

Tech (1 matching dictionary)

23. blue-sky: Webster's New World Telecom Dictionary

(Note: See blue_skying as well.)

Definitions from Wiktionary (Blue sky) ▸ adjective:  Alternative form of blue-sky [(US, finance, dated) Involving or relating to fake stocks and bonds.] Similar: blue, Blue Air, wild blue yonder, aboveboard, on the up and up, greyhat, black-and-blue, bird-brained, naked as a jay-bird, sun-glassed, more... Opposite: night, darkness Types: navy blue, azure blue, ceruleblue, turquoise blue, baby blue, royal blue, powder blue, more... Phrases: blue sky law, blue sky laws, out of a clear blue sky, blue sky software, blue sky thinking, more... Adjectives: blue-chip, bluey, blue, pastoralist, bijou, farmerly, free and easy, true-blue, slavelike, fielden ▸ Words similar to blue sky ▸ Usage examples for blue sky ▸ Idioms related to blue sky ▸ Wikipedia articles (New!) ▸ Popular nouns described by blue sky ▸ Words that often appear near blue sky ▸ Rhymes of blue sky ▸ Invented words related to blue sky