| Term: | Horn |
| Definition: | Horn-shaped mountain or nunatak. |
| Term: | Horn |
| Definition: | A pointed, mountain peak, typically pyramidal in shape, bounded by the walls of three or more cirques. Headward erosion has cut prominent faces and ridges into the peak. When a peak has four symmetrical faces, it is called a Matterhorn. |
| Term: | Horn |
| Definition: | Pyramidal peak that forms when several cirques erode a mountain from three or more sides. |
| Term: | Horn |
| Definition: | A peak or pinnacle thinned and eroded by three or more glacial cirques. |