We found 16 dictionaries that define the word tumors:

General (10 matching dictionaries)

1. tumors: Merriam-Webster
2. tumors: Collins English Dictionary
3. tumors: Vocabulary.com
4. Tumors, tumor's, tumors: Wordnik
5. tumors: Cambridge Advanced Learner's Dictionary
6. tumors: Wiktionary
7. tumors: Dictionary.com
8. tumors: Cambridge Essential American English Dictionary
9. Tumors: Wikipedia, the Free Encyclopedia
10. Tumors: TheFreeDictionary.com

Computing (1 matching dictionary)

11. Tumors: Encyclopedia

Medicine (4 matching dictionaries)

12. tumors: Merriam-Webster Medical Dictionary
13. Tumors: Merck Manuals
14. Specific Diseases/Disorders (No longer online)
15. Tumors: Medical dictionary

Slang (1 matching dictionary)

16. Tumors: Urban Dictionary

(Note: See tumor as well.)

Definitions from Wiktionary (tumor) ▸ noun:  (oncology, pathology) An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia. ▸ Also see tumor Opposite: health, normalcy, benignity, wellness, stability Phrases: brain tumors, malignant tumors, benign tumors, bone tumors, pituitary tumors, more... Adjectives: malignant, benign, primary, solid, human, ovarian, small, large, mixed, intracranial, epithelial ▸ Words similar to tumors ▸ Usage examples for tumors ▸ Idioms related to tumors ▸ Wikipedia articles (New!) ▸ Popular adjectives describing tumors ▸ Words that often appear near tumors ▸ Rhymes of tumors ▸ Invented words related to tumors