bathyal
/ˈbæθiəl/
adjective
- Relating to the deep ocean zone between about 200 and 4,000 meters (660–13,000 feet) below the surface, where little light reaches.
- Few plants can survive in the dark bathyal waters of the deep sea.
- Scientists study bathyal sediments to learn about ancient ocean conditions.
- The bathyal zone is home to strange fish that produce their own light.