Definition of onco- in English:

onco-

Pronunciation: /ˈɒŋkəʊ/

combining form

Relating to tumours: oncology

Origin

from Greek onkos 'mass'.

Definition of onco- in:

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous