Definitions

1. adjective

relating to or denoting the zone of water extending from about 200 to 1,000 meters below the surface of the sea, characterized by dim light and relatively little oxygen.

“The deep-sea creatures living in the bathypelagic zone have adapted to the extreme conditions.”

2. noun

the zone of water extending from about 200 to 1,000 meters below the surface of the sea, characterized by dim light and relatively little oxygen.

“The submarine dove into the bathypelagic zone, where the darkness was almost total.”