Definition of -onym in English:

-onym

Syllabification: -onym

combining form

Forming nouns:
1Denoting a type of name: pseudonym
2Denoting a word having a specified relationship to another: antonym

Origin

from Greek -ōnumon, neuter of -ōnumos, combining form of onoma 'name'.

Definition of -onym in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous