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
And because the growth was in his midbrain stem, there was no way to remove the tumor, said his mom, Huifan Chan.
—Jason Mastrodonato, The Mercury News, 10 Aug. 2024
Armed with this knowledge, today’s cancer researchers and oncologists are turning their attention toward precision medicine, which involves treatments tailored to an individual’s genetics and lifestyle, as well as the cellular and molecular characteristics of the tumor and its microenvironment.
—Molly Peck, USA TODAY, 10 Aug. 2024
In a phase 3 trial of more than 300 participants, the drug was shown to significantly improve how long a patient could live without the tumor growing, according to the New England Journal of Medicine.
—Zachery Eanes, Axios, 9 Aug. 2024
In addition, aspirin may boost the immune system’s response to cancer and block the development of blood vessels that supply nutrients to growing tumors, Chan adds.
—Lisa Rapaport, EverydayHealth.com, 2 Aug. 2024
See all Example Sentences for tumor 
Jason Mastrodonato, The Mercury News, 10 Aug. 2024
Armed with this knowledge, today’s cancer researchers and oncologists are turning their attention toward precision medicine, which involves treatments tailored to an individual’s genetics and lifestyle, as well as the cellular and molecular characteristics of the tumor and its microenvironment.
—Molly Peck, USA TODAY, 10 Aug. 2024
In a phase 3 trial of more than 300 participants, the drug was shown to significantly improve how long a patient could live without the tumor growing, according to the New England Journal of Medicine.
—Zachery Eanes, Axios, 9 Aug. 2024
In addition, aspirin may boost the immune system’s response to cancer and block the development of blood vessels that supply nutrients to growing tumors, Chan adds.
—Lisa Rapaport, EverydayHealth.com, 2 Aug. 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 19 Aug. 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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