on·col·o·gy

[ong-kol-uh-jee]
noun
1.
the branch of medical science dealing with tumors, including the origin, development, diagnosis, and treatment of malignant neoplasms.
2.
the study of cancer.

Origin:
1855–60; onco- + -logy

on·co·log·ic [ong-kuh-loj-ik] , on·co·log·i·cal, adjective
on·col·o·gist, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
oncology (ɒŋˈkɒlədʒɪ) [Click for IPA pronunciation guide]
 
n
the branch of medicine concerned with the study, classification, and treatment of tumours
 
oncological
 
adj
 
on'cologist
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Oncology is always a great word to know.
So is bezoar. Does it mean:
the offspring of a zebra and a donkey.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

oncology
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-)
n.
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
The test helps explain a long-standing puzzle in oncology.
We have been told by an oncology surgeon that her case is inoperable.
Eat lunch at that cafeteria and you will hear conversations that drift from holography to oncology.
If so, you are applying a radiation oncology technique rather than a chemotherapy technique.
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