Dor"mer (?), ∨ Dor"mer win"dow (), n. [Literally, the window of a sleeping apartment. F. dormir to sleep. See Dormant, a. & n.] Arch.
A window pierced in a roof, and so set as to be vertical while the roof slopes away from it. Also, the gablet, or houselike structure, in which it is contained.
© Webster 1913.