Definition of onomast in English:

onomast

Syllabification: on·o·mast
Pronunciation: /ˈänəˌmast
 
/

noun

A person who studies proper names, especially personal names.
More example sentences
  • Offshore onomasts and eponymists might favour something like Aimless Aussie if it came from our shores.

Origin

1980s: back-formation from onomastic.

Definition of onomast in:

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Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous