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. WhiteExamples of tumor in a Sentence
the scan showed a small tumor in her abdomen
Recent Examples on the Web
The increase was found in certain types of cancer including leukemias, lymphomas, brain tumors, hepatic tumors, and gonadal germ cell tumors, according to the study.
—Mary Kekatos, ABC News, 5 Mar. 2025
Mia Love, the first Black Republican woman elected to Congress, is no longer responding to treatment for an aggressive and malignant brain tumor known as glioblastoma, with which she was diagnosed in 2022.
—Cara Lynn Shultz, People.com, 3 Mar. 2025
That kind of tumor originates in nervous system cells, according to the Cleveland Clinic, and the grade Mixsooke had was aggressive, base officials said.
—Sara Schilling, Sacramento Bee, 3 Mar. 2025
This is an alternative treatment option for depression, anxiety, OCD, PTSD and other mental health conditions, along with migraines, brain tumors, epilepsy and chronic pain.
—Mari Pressley, Charlotte Observer, 3 Mar. 2025
See All Example Sentences for tumor
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Mary Kekatos, ABC News, 5 Mar. 2025
Mia Love, the first Black Republican woman elected to Congress, is no longer responding to treatment for an aggressive and malignant brain tumor known as glioblastoma, with which she was diagnosed in 2022.
—Cara Lynn Shultz, People.com, 3 Mar. 2025
That kind of tumor originates in nervous system cells, according to the Cleveland Clinic, and the grade Mixsooke had was aggressive, base officials said.
—Sara Schilling, Sacramento Bee, 3 Mar. 2025
This is an alternative treatment option for depression, anxiety, OCD, PTSD and other mental health conditions, along with migraines, brain tumors, epilepsy and chronic pain.
—Mari Pressley, Charlotte Observer, 3 Mar. 2025
See All Example Sentences for tumor
Cite this Entry
“Tumor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tumor. Accessed 12 Mar. 2025.
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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