[ ong-kol-uh-jee ]
/ ɒŋˈkɒl ə dʒi /


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

Nearby words

  1. oncogenic,
  2. oncogenic virus,
  3. oncogenicity,
  4. oncolite,
  5. oncologic,
  6. oncolysis,
  7. oncoming,
  8. oncoplastic carcinoma,
  9. oncornavirus,
  10. oncosis

Origin of oncology

First recorded in 1855–60; onco- + -logy

Related formson·co·log·ic [ong-kuh-loj-ik] /ˌɒŋ kəˈlɒdʒ ɪk/, on·co·log·i·cal, adjectiveon·col·o·gist, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for oncology

British Dictionary definitions for oncology


/ (ɒŋˈkɒlədʒɪ) /


the branch of medicine concerned with the study, classification, and treatment of tumours
Derived Formsoncological (ˌɒŋkəˈlɒdʒɪkəl), adjectiveoncologist, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for oncology



1857, coined in English from onco- "tumor" + -logy "science or study of." Related: Oncologist; oncological.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for oncology


[ ŏng-kŏlə-jē ]


The branch of medicine dealing with the physical, chemical, and biological properties of tumors, including study of their development, diagnosis, treatment, and prevention.
Related formson′co•logi•cal (-kə-lŏjĭ-kəl) null adj.on•colo•gist n.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for oncology


[ ŏn-kŏlə-jē ]

The branch of medicine that deals with the diagnosis and treatment of cancer.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Culture definitions for oncology


[ (ong-kol-uh-jee, on-kol-uh-jee) ]

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

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.