a combining form meaning “tumor,” “mass,” used in the formation of compound words: oncogenic.
- oncocytic hepatocellular tumor,
- oncofetal antigen
Origin of onco-
combining form of Greek ónkos mass, bulk
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
denoting a tumouroncology
Word Origin for onco-
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-forming element meaning "bulk, mass," especially in medical use, "tumor," from Latinized form of Greek onko-, comb. form of onkos "bulk, size, mass, body."
Online Etymology Dictionary, © 2010 Douglas Harper
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.