tumor

noun
tu·​mor | \ ˈtü-mər How to pronounce tumor (audio) , ˈtyü-\

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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Other Words from tumor

tumoral \ ˈtü-​mə-​rəl How to pronounce tumoral (audio) , ˈtyü-​ \ adjective
tumorlike \ ˈtü-​mər-​ˌlīk How to pronounce tumorlike (audio) , ˈtyü-​ \ adjective

Examples of tumor in a Sentence

the scan showed a small tumor in her abdomen

Recent Examples on the Web

To minimize the risk of colorectal cancer, adults should start getting screened for these tumors at age 45, according to the American Cancer Society. Reuters, The Mercury News, "Men: Want lower risk of colorectal cancer? Eat yogurt," 3 July 2019 Enrique Galván, a 27-year-old Paraguay native who has endured bullying his whole life for the massive tumors on his body, has undergone a life-saving surgery. Eric Todisco, PEOPLE.com, "Paraguay Man Bullied for His Massive Tumors Has Surgery to Remove 6 Lbs. of Tissue," 14 June 2019 Pfizer’s main immunotherapy, Bavencio, developed with Merck KGaA and approved last year to treat two different relatively rare cancers, has failed four late-stage studies for other tumors. Jared S. Hopkins, WSJ, "Pfizer Pivots to Cancer Drugs for Growth," 27 Jan. 2019 Some of the standard treatments for cancer, such as chemotherapy and radiation, are known to weaken the heart or increase the risks for subsequent tumors, including in children. Gretchen Reynolds, New York Times, "For Survivors of Childhood Cancer, Walk," 20 June 2018 Take, for example, someone who had a tumor removed in one breast in their 40s a decade ago, when genetic testing wasn't as common. NBC News, "Guidelines say more women may need breast cancer gene test," 20 Aug. 2019 Consider a patient who had a tumor removed in one breast in her 40s a decade ago, when genetic testing wasn’t as common. Lauran Neergaard, Los Angeles Times, "More women should consider BRCA test to assess breast cancer risk, new guidelines say," 20 Aug. 2019 Take, for example, someone who had a tumor removed in one breast in their 40s a decade ago, when genetic testing wasn’t as common. Lauran Neergaard, The Denver Post, "Guidelines say more women may need breast cancer gene test," 20 Aug. 2019 In December, 1971, while Dershowitz was on sabbatical in Palo Alto, his ten-year-old son, Elon, was diagnosed as having a brain tumor. Connie Bruck, The New Yorker, "Alan Dershowitz, Devil’s Advocate," 5 Aug. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tumor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of tumor

15th century, in the meaning defined at sense 2

History and Etymology for tumor

Middle English tumour, from Latin tumor, from tumēre

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Statistics for tumor

Last Updated

13 Sep 2019

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Time Traveler for tumor

The first known use of tumor was in the 15th century

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More Definitions for tumor

tumor

noun

English Language Learners Definition of tumor

: a mass of tissue found in or on the body that is made up of abnormal cells

tumor

noun
tu·​mor | \ ˈtü-mər How to pronounce tumor (audio) , ˈtyü-\

Kids Definition of tumor

: an abnormal growth of body tissue

tumor

noun
tu·​mor
variants: or chiefly British tumour \ ˈt(y)ü-​mər How to pronounce tumour (audio) \

Medical Definition of tumor

: 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

Other Words from tumor

tumorlike \ -​ˌlīk How to pronounce tumorlike (audio) \ adjective

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More from Merriam-Webster on tumor

Rhyming Dictionary: Words that rhyme with tumor

Thesaurus: All synonyms and antonyms for tumor

Spanish Central: Translation of tumor

Nglish: Translation of tumor for Spanish Speakers

Britannica English: Translation of tumor for Arabic Speakers

Britannica.com: Encyclopedia article about tumor

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