We found 6 dictionaries that define the word blue flags:

General (4 matching dictionaries)

1. blue flags: Merriam-Webster
2. blue flags: Vocabulary.com
3. blue flags: Wiktionary
4. blue flags: TheFreeDictionary.com

Medicine (2 matching dictionaries)

5. blue flags: Merriam-Webster Medical Dictionary
6. blue flags: Medical dictionary

(Note: See blue_flag as well.)

Definitions from Wiktionary (blue flag) ▸ noun:  An award given to European beaches, based on cleanliness and water quality. ▸ Also see blue_flag ▸ Words similar to blue flags ▸ Usage examples for blue flags ▸ Idioms related to blue flags ▸ Wikipedia articles (New!) ▸ Words that often appear near blue flags ▸ Rhymes of blue flags ▸ Invented words related to blue flags