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tumor

[too-mer, tyoo-] / ˈtu mər, ˈtyu- /
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.

He had a brain tumor removed in 2021 and underwent months of therapy.

From Los Angeles Times • Apr. 23, 2026

"In cancer, for instance, you want to understand how the interaction of cells may relate to some of them breaking away from a tumor and moving to a new place, becoming metastatic."

From Science Daily • Apr. 23, 2026

To reach these conclusions, the scientists analyzed tumor samples from more than 200 melanoma patients in the U.S.,

From Science Daily • Apr. 21, 2026

RAS mutations that drive tumor growth in 90% of pancreatic patients—as well as a large share of colon and non-small cell lung cancer cases—have long been considered “undruggable.”

From The Wall Street Journal • Apr. 19, 2026

Research into HPV eventually uncovered how Henrietta’s cancer started: HPV inserted its DNA into the long arm of her eleventh chromosome and essentially turned off her p 5 3 tumor suppressor gene.

From "The Immortal Life of Henrietta Lacks" by Rebecca Skloot




Vocabulary lists containing tumor