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
W. A. White
Examples of tumor in a Sentence
the scan showed a small tumor in her abdomen
Recent Examples on the Web
Isabella Strahan is showing off her hair growth since finishing chemotherapy for her brain tumor.
—Vanessa Etienne, People.com, 20 Nov. 2024
Thomas died in March 2019 from a brain tumor, leaving the rapper without any living parents.
—Elizabeth Ayoola, Essence, 1 Nov. 2024
Her mother Holly Thomas, who served as her foremost role model, confidante, and motivator, had died the previous year from a brain tumor.
—Andrew R. Chow, TIME, 31 Oct. 2024
Isabella was diagnosed with a medulloblastoma, a rare brain tumor, in October 2023, and underwent surgery and chemotherapy.
—Nina Turner, Newsweek, 30 Oct. 2024
See all Example Sentences for tumor 
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Vanessa Etienne, People.com, 20 Nov. 2024
Thomas died in March 2019 from a brain tumor, leaving the rapper without any living parents.
—Elizabeth Ayoola, Essence, 1 Nov. 2024
Her mother Holly Thomas, who served as her foremost role model, confidante, and motivator, had died the previous year from a brain tumor.
—Andrew R. Chow, TIME, 31 Oct. 2024
Isabella was diagnosed with a medulloblastoma, a rare brain tumor, in October 2023, and underwent surgery and chemotherapy.
—Nina Turner, Newsweek, 30 Oct. 2024
See all Example Sentences for tumor
Dictionary Entries Near tumor
Cite this Entry
“Tumor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tumor. Accessed 28 Nov. 2024.
Copy CitationKids Definition
tumor
noun
tu·mor
ˈt(y)ü-mər 
: an abnormal mass of tissue that arises from normal tissue cells and serves no useful purpose in the body
tumorous
adjective
ˈt(y)üm-(ə-)rəs
Medical Definition
tumor
noun
tu·mor
variants
or chiefly British tumour
: an abnormal benign or malignant new growth of tissue that possesses no physiological function and arises from uncontrolled usually rapid cellular proliferation see cancer sense 1, carcinoma, sarcoma
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