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
In the first days following surgery to remove two brain tumors, Dodgers team historian Mark Langill was having trouble recalling everything but the legacy that lives permanently in the deepest blue part of his soul.
—Bill Plaschke, Los Angeles Times, 23 June 2024
In December of last year, Hadley shared that he was diagnosed with seminoma cancer, a malignant germ cell tumor that is typically found in the testicle.
—Selena Kuznikov, Variety, 22 June 2024
Paying Tribute to the Celebrities Who Have Died in 2024
Hadley first revealed in December 2023 that he was diagnosed with seminoma cancer —which is a malignant germ cell tumor that is typically found in the testicle, per the National Library of Medicine.
—Charna Flam, Peoplemag, 22 June 2024
The idea is that finding tumor DNA in the blood probably means that cancer cells are still growing somewhere in the body, even at a low level.
—Angus Chen, STAT, 17 June 2024
See all Example Sentences for tumor 
Bill Plaschke, Los Angeles Times, 23 June 2024
In December of last year, Hadley shared that he was diagnosed with seminoma cancer, a malignant germ cell tumor that is typically found in the testicle.
—Selena Kuznikov, Variety, 22 June 2024
Paying Tribute to the Celebrities Who Have Died in 2024
Hadley first revealed in December 2023 that he was diagnosed with seminoma cancer —which is a malignant germ cell tumor that is typically found in the testicle, per the National Library of Medicine.
—Charna Flam, Peoplemag, 22 June 2024
The idea is that finding tumor DNA in the blood probably means that cancer cells are still growing somewhere in the body, even at a low level.
—Angus Chen, STAT, 17 June 2024
See all Example Sentences for tumor
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'tumor.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near tumor
Cite this Entry
“Tumor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tumor. Accessed 26 Jun. 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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