alcoved

A broad shaft of morning light poured through the open doorway in the ceiling of the room which was about thirty feet square, or roughly square, being irregular in shape, one side curving outward, another being indented by what might have been the corner of another building jutting into it, another alcoved by three sides of an octagon, while the fourth was serpentine in contour.

These rambling, sway-backed tunnels are very attractive things, with their alcoved outlooks upon the lovely and inspiriting water.