properly only an opening in a house for the admission of light and air, covered with lattice-work, which might be opened or closed ( 2 Kings 1:2 ; Acts 20:9 ). The spies in Jericho and Paul at Damascus were let down from the windows of houses abutting on the town wall ( Joshua 2:15 ; 2 co 11:33 ). The clouds are metaphorically called the "windows of heaven" ( Genesis 7:11 ; Malachi 3:10 ). The word thus rendered in Isaiah 54:12 ought rather to be rendered "battlements" (LXX., "bulwarks;" RSV, "pinnacles"), or as Gesenius renders it, "notched battlements, i.e., suns or rays of the sun"= having a radiated appearance like the sun.

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.