The phrase "round window" refers to a circular opening usually seen on buildings, vehicles, or even electronic devices. It is called a round window because of its shape, resembling a circle. Full definition
The new round window in my kitchen was chosen for its design impact on the room. (theinspiredroom.net)
It sounds like you have been a champ at going with the flow, but I can feel your frustration about your beautiful round window frame. (theinspiredroom.net)
What a wonderful bath with the large round window... it would be a pleasure to send some down time in this home! (theinspiredroom.net)