وَبِالْجَارِي مَجْرَى الصَّحِيحِ، وَهُوَ مَا يَكُونُ فِي آخِرِهِ وَاوٌ أَوْ يَاءٌ مَا قَبْلَهُمَا سَاكِنٌ، كَـ«دَلْوٍ وَظَبْيٍ».
Translation: The same rule applies to what is treated like a sound-final noun: a word ending in wāw or yāʾ with a sukūn on the preceding letter, such as “دَلْوٍ” and “ظَبْيٍ.”
دَلْو means “bucket” and ظَبْي means “gazelle.” Their final wāw or yāʾ can carry the visible case endings, so the author places them in the same class as sound-final nouns.