oncology
Americannoun
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the branch of medical science dealing with tumors, including the origin, development, diagnosis, and treatment of malignant neoplasms.
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the study of cancer.
noun
Other Word Forms
Etymology
Origin of oncology
Explanation
Oncology is the branch of medicine that deals with tumors and cancer. A doctor who practices oncology is called an oncologist. You probably think of cancer treatment as a modern practice, but the word oncology has its roots in ancient Greek. The prefix onkos means "mass or bulk” (and eventually evolved into the modern Latin onco — meaning tumor) and the suffix logy means “study of.” In theory, the word means “the study of tumors.” More often, though, you will hear oncology in relation to treatment and practical medicine, as opposed to just study or research.
Vocabulary lists containing oncology
The Fault in Our Stars
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National Nurses Week: Medical Branches and Conditions
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This Week In Culture: October 17–23, 2020
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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.
A brand-new treatment for pancreatic cancer may be the best oncology launch of all time.
From MarketWatch ● Nov. 5, 2026
She said the health board's clinical strategy for oncology had led to "key developments", including nurse-led clinics and the introduction of colorectal and breast metastatic nurse specialist teams.
From BBC ● Nov. 1, 2026
Group revenue grew seven percent to $16.2 billion in the third quarter from a year earlier, with oncology accounting for 48 percent of the total.
From Barron's ● Oct. 30, 2026
AstraZeneca said it benefited from double-digit sales growth in its oncology, respiratory and immunology, and rare disease therapeutic areas, which allowed it to offset hits from generic competition for aging medicines Farxiga and Brilinta.
From The Wall Street Journal ● Oct. 30, 2026
A distinction is thus drawn between cysts and growths—one which is of daily importance in the practice of medicine—and Virchow's oncology includes the consideration of the two varieties of tumors.
From A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases by Various
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
