We found 53 dictionaries that define the word tumor:

General (26 matching dictionaries)

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

Computing (1 matching dictionary)

25. tumor: Encyclopedia

Medicine (22 matching dictionaries)

26. Dorland's Illustrated Medical Dictionary (No longer online)
27. Tumor: MedTerms.com Medical Dictionary
28. ABTA Brain Tumor Patients (No longer online)
29. Breast Cancer Talking Dictionary (No longer online)
30. tumor: Chronic Fatigue Syndrome Glossary
31. Tumor: Merck Manuals
32. tumor: Chronic Fatigue Syndrome
33. Cancer Glossary (No longer online)
34. Health and Wellness Dictionary (No longer online)
35. Hepatitis C Information Central (No longer online)
36. tumor: Prostate Cancer Interactive Glossary
37. Tumor: Glossary of Lymphoma Terms
38. Tumor: Breast Cancer Glossary of Medical Terms
39. Tumor: MEDLINE plus Illustrated Medical Encyclopedia
40. tumor: Dictionary of Cancer Terms
41. Glossary of HIV/AIDS Related Terms (No longer online)
42. Skin Cancer Information (No longer online)
43. tumor: Medical dictionary
44. University of Maryland Glossary of Medical Terms (No longer online)
45. Vitamin Glossary (No longer online)
46. Tumor: Drug Medical Dictionary
47. Hyperdictionary (No longer online)

Science (1 matching dictionary)

48. Drug Discovery and Development (No longer online)

Slang (1 matching dictionary)

49. tumor, the tumor: Urban Dictionary

Tech (2 matching dictionaries)

50. tumoral as well.)
    
    

Definitions from Wiktionary ( ) ▸ noun:  (oncology, pathology) An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia. Similar: neoplasm, tumour, tumorous, nontumor, tumoural, micrometastasis, lesion, metastasis, meningioma, glioblastoma, more... Opposite: health, wellness, normalcy, benignity, vitality Types: benign, malignant, benign tumor, malignant tumor, more... Phrases: tumor cells, tumor cell, brain tumor, primary tumor, tumor suppressor, more... Adjectives: primary, malignant, benign, large, common, giant, ovarian, mixed, pituitary, residual, solid Colors:     gray,     pink,     red,     brown,     yellow,     white,     black,     purple,     blue,     green ▸ Word origin ▸ Words similar to tumor ▸ Usage examples for tumor ▸ Idioms related to tumor ▸ Wikipedia articles (New!) ▸ Popular adjectives describing tumor ▸ Words that often appear near tumor ▸ Rhymes of tumor ▸ Invented words related to tumor