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Definitions

tumor

[too-mer, tyoo-] / ˈtu mər, ˈtju- /
NOUN
abnormal growth in animate being
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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While we hear the stories of those whose scans found a dangerous tumor, we don’t hear from the many more who went through an unnecessary workup for something that was never going to harm them.

From Slate Sep. 9, 2026

The scan found a mass in her brain, and surgery revealed that to be a malignant brain tumor.

From Slate Sep. 9, 2026

Exactly why losing those genes causes such a dramatic change in tumor cell identity, however, remained unclear.

From Science Daily Sep. 8, 2026

"These cells can hide from chemotherapy and then remain in this dormant quiescent state in the tumor, and then later reactivate to drive proliferation."

From Science Daily Sep. 6, 2026

It swelled like a tumor jacked up on steroids, burning through a haze so white it glared.

From "Burning Blue" by Paul Griffin

TwoStep Therapeutics, a San Carlos, Calif.-based startup developing targeted therapies for solid tumors, nabbed $62.5 million in Series A financing from investors including Insight Partners, Medical Excellence Capital, M Ventures and Pfizer Ventures.

From The Wall Street Journal Sep. 10, 2026

"Distinguishing between patients whose tumors will never undergo this transition versus patients whose tumors may will help us use this treatment effectively and early."

From Science Daily Sep. 8, 2026

Meanwhile, the Food and Drug Administration last month approved a therapy for pancreatic tumors, a breakthrough in fighting one of the deadliest forms of cancer.

From The Wall Street Journal Sep. 7, 2026

In June, Beijing regulators greenlighted a CAR-T treatment for a cancer of the stomach and upper small intestine—the world’s first approved CAR-T therapy for solid tumors.

From The Wall Street Journal Sep. 7, 2026

Scientists of the Food and Drug Administration who reported the discovery of these tumors were uncertain how to classify them, but felt there was some “justification for considering them low grade hepatic cell carcinomas.”

From "Silent Spring" by Rachel Carson




Vocabulary lists containing tumor


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