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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
Words nearby onco-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
British Dictionary definitions for onco-
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