verb form X āistā^abbahu AisotaA^ab~ahu اِسْتَأَبَّهُ Bookmark Bookmarked Share He adopted him as a father; an extr. form; (IAar, M;) from أَبٌّ, a dialect var. of أَبٌ: (TA:) regularly, اِسْتَأْبَاهُ. (M.) And استأبّ أَبًا and اِسْتَأْبَبَ أَبًا He adopted a father. (TA in article ابو.)