We found 57 dictionaries that define the word pneumonia:

General (26 matching dictionaries)

1. pneumonia: Merriam-Webster.com
2. pneumonia: Oxford Learner's Dictionaries
3. pneumonia: American Heritage Dictionary of the English Language
4. pneumonia: Collins English Dictionary
5. pneumonia: Vocabulary.com
6. Pneumonia, pneumonia: Wordnik
7. pneumonia: Cambridge Advanced Learner's Dictionary
8. pneumonia: Wiktionary
9. pneumonia: Webster's New World College Dictionary, 4th Ed.
10. pneumonia: The Wordsmyth English Dictionary-Thesaurus
11. pneumonia: Infoplease Dictionary
12. pneumonia: Dictionary.com
13. pneumonia: Online Etymology Dictionary
14. pneumonia: Cambridge Essential American English Dictionary
15. Pneumonia (album), Pneumonia (disambiguation), Pneumonia (non-human): Wikipedia, the Free Encyclopedia
16. pneumonia: Rhymezone
17. Pneumonia: AllWords.com Multi-Lingual Dictionary
18. pneumonia: Webster's 1828 Dictionary
19. pneumonia: Free Dictionary
20. pneumonia: Mnemonic Dictionary
21. pneumonia: Dictionary/thesaurus
22. Pneumonia: Wikipedia, the Free Encyclopedia
23. Pneumonia: Online Plain Text English Dictionary
24. pneumonia: Webster's Revised Unabridged, 1913 Edition

Art (1 matching dictionary)

25. Pneumonia: Health & Beauty Glossary

Computing (1 matching dictionary)

26. pneumonia: Encyclopedia

Medicine (21 matching dictionaries)

27. Dorland's Illustrated Medical Dictionary (No longer online)
28. Pneumonia: MedTerms.com Medical Dictionary
29. Medical Dictionary (No longer online)
30. Breast Cancer Talking Dictionary (No longer online)
31. Pneumonia: Merck Manuals
32. online medical dictionary (No longer online)
33. Health and Wellness Dictionary (No longer online)
34. Probert Encyclopaedia of Medicine (No longer online)
35. Hepatitis C Information Central (No longer online)
36. Specific Diseases/Disorders (No longer online)
37. KidsHealth Glossary of Medical Words (No longer online)
38. Pneumonia: MEDLINE plus Illustrated Medical Encyclopedia
39. pneumonia: Dictionary of Cancer Terms
40. National Immunization Program Glossary (No longer online)
41. pneumonia: Parents' Common Sense Encyclopedia
42. Glossary of HIV/AIDS Related Terms (No longer online)
43. A-Z Family health glossary (No longer online)
44. -pneumonia, pneumonia: Medical dictionary
45. University of Maryland Glossary of Medical Terms (No longer online)
46. Pneumonia: Drug Medical Dictionary
47. Hyperdictionary (No longer online)

Miscellaneous (2 matching dictionaries)

48. Sociology (No longer online)
49. pneumonia: Idioms

Science (1 matching dictionary)

50. Agricultural Thesaurus and Glossary (No longer online)

Slang (2 matching dictionaries)

51. pneumonia: Green’s Dictionary of Slang
52. pneumonia: Urban Dictionary

Tech (3 matching dictionaries)

53. Dairy Glossary (No longer online)
54. Pneumonia: Beauty & Health Glossary
55. Washington State Definitions and Abbreviations of Vetrinary Terms (No longer online)

(Note: See pneumonias as well.)

Definitions from Wiktionary ( ) ▸ noun:  An acute or chronic inflammation of the lungs caused by viruses, bacteria or other microorganisms, or sometimes by physical or chemical irritants. Similar: lobar pneumonia, pulmonitis, pneumocytosis, pneumococcus, metapneumonia, pneumocystis pneumonia, pneumovirus, atypical pneumonia, walking pneumonia, pneumotoxicity, more... Opposite: health, wellness, vigor, robustness, strength Types: atypical, bacterial, viral, fungal, legionnaires', more... Phrases: Aspiration pneumonia, Bacterial pneumonia, interstitial pneumonia, lobar pneumonia, pneumococcal pneumonia, more... Adjectives: lobar, interstitial, bacterial, broncho, pneumococcal, acute, atypical, acquired, nosocomial, croupous, primary Colors:     blue,     gray,     white,     cyan,     teal, more... ▸ Word origin ▸ Words similar to pneumonia ▸ Usage examples for pneumonia ▸ Idioms related to pneumonia ▸ Wikipedia articles (New!) ▸ Popular adjectives describing pneumonia ▸ Words that often appear near pneumonia ▸ Rhymes of pneumonia ▸ Invented words related to pneumonia