وَإِذَا قَطَعْتَ هَذِهِ الْأَسْمَاءَ عَنِ الْإِضَافَةِ، قُلْتَ: «أَخٌ وَأَبٌ وَحَمٌ وَهَنٌ وَفَمٌ»، وَ«ذُو» لَا يُقْطَعُ عَنِ الْإِضَافَةِ الْبَتَّةَ.
Translation: When these nouns are no longer in iḍāfah, the book gives akhun, abun, ḥamun, hanun and famun. Dhū, however, is not used detached from iḍāfah.
This contrasts possessive abī (“my father”) with unannexed abun (“a father”).