onco-

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

   oncogenic.

onco-

combining_form

1. denoting a tumour

   oncology

Word History and Origins

Origin of onco-¹

Combining form of Greek ónkos mass, bulk

Word History and Origins

Origin of onco-¹

from Greek onkos

Example Sentences

I have, in conclusion, to relate an incident I onco witnessed, and which does not show the Monedula in a very amiable light.

From Project Gutenberg