ọ́n pron /ɔ̃̄/ mid-tone /ɔ̃́/ high-tone
Definitions
  1. him, her, it (third-person singular non-honorific object pronoun following a monosyllabic verb with a low- or mid-tone /ɔ̃/)
Source: Wiktionary, where this word is spelled “ọn”. Reference: en-ọn-yo-pron-7s060eCI