
In Italian a dormer is called “abbaino”, with the accent on the i, a word that sounds strange even to us. The obvious etym would be “abbaiare” (to bark), but this is not the case. It does probably come from the old Genoese dialectal form
abbaèn, which literally means a young abbot, but was often used for young friars. In fact, the slate cover of the dormers was similar to the grey of the young friars' frocks. Others say that it is a form of “abbadino”, which comes from “badare” (to watch), or from the French
baie (an opening in a wall).
External links:
Dormer (Wikipedia)