Definition of tumor
1
: an abnormal benign or malignant new growth of tissue that possesses no physiological function and arises from uncontrolled usually rapid cellular proliferation
— called also neoplasm
2
: a swollen or distended part
… houses that bulged with the tumors and warts of … ornamental architecture …— W. A. White
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Merriam-Webster unabridged
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Time Traveler for tumor
The first known use of tumor was in the 15th century
See more words from the same century