A reflective optical prism containing a section where two faces meet at a 90° angle, resembling the roof of a building. Reflection from the two 90° faces returns an image that is flipped laterally across the axis where the faces meet.

Any of the bones covering the brain, eyes, and nostrils in bony fishes and all land-living vertebrates.

plural of pent roof

The various high mountainous regions in Asia, made up of the Pamirs, the Himalayas, Tibet and Mount Everest.

Any of various designs of nails used to fasten roofing materials to a substrate, with large heads intended to minimize the risk of leaks.

simple past tense and past participle of raise the roof

Third-person singular simple present indicative form of raise the roof

present participle of raise the roof

plural of span roof

Riding illegally on the roof of a train (or car, bus, etc) for the thrills. / Sliding down the roof for fun.