Definition of -onym in English:

-onym

combining form

  • 1Forming nouns:

    1. 1.1 Denoting a type of name.
      ‘pseudonym’
    2. 1.2 Denoting a word having a specified relationship to another.
      ‘antonym’

Origin

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