English

not a real father or a nature father (as distinct from foster father)

康熙字典

【巳集中】【父字部】㸗 ·康熙筆画：10 ·部外筆画：6

《五音集韻》徒紅切，音同。父也。《正字通》从父从同。謂親之如父，與淮南假母義同。非生母故謂之假，非生父故謂之同。