dor‧mer /ˈdɔːmə $ ˈdɔːrmər/ ,
ˈdormer ˌwindow British English noun [countable][
Date: 1500-1600;
Language: Old French;
Origin: dormeor 'sleeping room', from dormir; ⇒ dormant]
a window built into a roof, so that it sticks out from the roof ⇒
skylight [TahlilGaran] Dictionary of Contemporary English ▲