We found 45 dictionaries that define the word flu:

General (25 matching dictionaries)

1. flu: Merriam-Webster.com
2. flu: Oxford Learner's Dictionaries
3. flu: American Heritage Dictionary of the English Language
4. flu, the flu: Collins English Dictionary
5. flu: Vocabulary.com
6. Flu, flu: Wordnik
7. flu: Cambridge Advanced Learner's Dictionary
8. 'flu, flu: Wiktionary
9. flu: Webster's New World College Dictionary, 4th Ed.
10. flu: The Wordsmyth English Dictionary-Thesaurus
11. flu: Infoplease Dictionary
12. flu: Dictionary.com
13. flu: Online Etymology Dictionary
14. flu: Cambridge Essential American English Dictionary
15. FLU, Flu (disambiguation), Flu (film), Flu, The Flu (Parks and Recreation), The Flu (film), The Flu, The flu: Wikipedia, the Free Encyclopedia
16. flu: Rhymezone
17. FLU, flu: Stammtisch Beau Fleuve Acronyms
18. flu: Free Dictionary
19. flu: Mnemonic Dictionary
20. flu: LookWAYup Translating Dictionary/Thesaurus
21. flu: Dictionary/thesaurus
22. flu: Wikimedia Commons US English Pronunciations
23. Flu (m): AllWords.com Multi-Lingual Dictionary

Art (1 matching dictionary)

24. flu-: A Cross Reference of Latin and Greek Elements

Computing (2 matching dictionaries)

25. flu: CCI Computer
26. Flu (disambiguation), The flu, flu: Encyclopedia

Medicine (11 matching dictionaries)

27. Dorland's Illustrated Medical Dictionary (No longer online)
28. Flu: MedTerms.com Medical Dictionary
29. Flu: Merck Manuals
30. online medical dictionary (No longer online)
31. Health and Wellness Dictionary (No longer online)
32. Probert Encyclopaedia of Medicine (No longer online)
33. The flu: MEDLINE plus Illustrated Medical Encyclopedia
34. A-Z Family health glossary (No longer online)
35. Flu (disambiguation), The flu, flu: Medical dictionary
36. University of Maryland Glossary of Medical Terms (No longer online)
37. Flu: Drug Medical Dictionary

Miscellaneous (4 matching dictionaries)

38. Sound-Alike Words (No longer online)
39. FLU: Acronym Finder
40. FLU: Three Letter Words with definitions
41. AbbreviationZ (No longer online)

Slang (2 matching dictionaries)

42. flu: Green’s Dictionary of Slang
43. Flu, The Flu: Urban Dictionary

(Note: See fluing as well.)

Definitions from Wiktionary ( ) ▸ noun:  Influenza. ▸ noun:  (informal) Stomach flu. Similar: influenza, grippe, influ, influenzavirus, superinfluenza, parainfluenzavirus, flurona, influenzavirus H1N1, pig flu, swine influenza, more... Opposite: cold, influenza Types: swine flu, avian flu, bird flu, Spanish flu, influenza, more... Phrases: swine flu, bird flu, flu virus, avian flu, Spanish flu, more... Adjectives: spanish, avian, asian, stomach, intestinal, bad, gastric, blue, pandemic, severe, mild Colors:     pale green,     mint green,     lavender,     pastel pink,     sky blue, more... ▸ Word origin ▸ Words similar to flu ▸ Usage examples for flu ▸ Idioms related to flu ▸ Wikipedia articles (New!) ▸ Popular adjectives describing flu ▸ Words that often appear near flu ▸ Rhymes of flu ▸ Invented words related to flu