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onco-

  1. a combining form meaning “tumor,” “mass,” used in the formation of compound words: oncogenic.
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Origin of onco-

combining form of Greek ónkos mass, bulk
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for onco-

onco-

combining form
  1. denoting a tumouroncology
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Word Origin

from Greek onkos
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 onco-

word-forming element meaning "bulk, mass," especially in medical use, "tumor," from Latinized form of Greek onko-, comb. form of onkos "bulk, size, mass, body."

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Online Etymology Dictionary, © 2010 Douglas Harper

onco- in Medicine

onco-

pref.
  1. Tumor:oncology.
  2. Mass; swelling:oncolysis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.