the branch of medical science dealing with tumors, including the origin, development, diagnosis, and treatment of malignant neoplasms.
the study of cancer.

1855–60; onco- + -logy

oncologic [ong-kuh-loj-ik] , oncological, adjective
oncologist, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
oncology (ɒŋˈkɒlədʒɪ)
the branch of medicine concerned with the study, classification, and treatment of tumours

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1857, coined in Eng. from Mod.L. onco- "tumor," from Gk. onkos "mass, bulk" + Eng. -logy "science or study of," from Gk. logia, from logos "word."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

oncology on·col·o·gy (ŏn-kŏl'ə-jē, ŏng-)
The branch of medicine dealing with the physical, chemical, and biological properties of tumors, including study of their development, diagnosis, treatment, and prevention.

on'co·log'i·cal (-kə-lŏj'ĭ-kəl) or on'co·log'ic (-lŏj'ĭk) adj.
on·col'o·gist n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
oncology   (ŏn-kŏl'ə-jē)  Pronunciation Key 
The branch of medicine that deals with the diagnosis and treatment of cancer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
oncology [(ong-kol-uh-jee, on-kol-uh-jee)]

The branch of medicine devoted to the study, treatment, and cure of cancer.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
After that, we'll get a referral to a specialist in veterinary oncology and see where to go from there.
Mouse cancers are not human cancers, so oncology models can be misleading.
Eat lunch at that cafeteria and you will hear conversations that drift from holography to oncology.
The test helps explain a long-standing puzzle in oncology.
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