—n. 1. a long, narrow elevation of land; a chain of hills or mountains.
2. the long and narrow upper edge, angle, or crest of something, as a hill, wave, or vault.
3. the back of an animal.
4. any raised, narrow strip, as on cloth.
5. the horizontal line in which the tops of the rafters of a roof meet.
6. (on a weather chart) a narrow, elongated area of high pressure.
—v.t. 1. to provide with or form into a ridge or ridges.
2. to mark with or as if with ridges.