Pronunciation: (därt'moor, -môr, -mōr),[key] —n. 1. a rocky plateau in SW England, in Devonshire. ab. 20 mi. (30 km) long.
2. a prison on this plateau.
3. one of an English breed of sheep having coarse, long wool.
4. one of an English breed of pony originating in Devon, noted for sure-footedness and longevity.