Definitions

1. adjective

relating to or found in the open sea, especially in deep water

“The pelagic zone of the ocean is home to many species of fish and other marine animals.”

2. adjective

relating to the open sea, especially in contrast to coastal or shallow waters

“The ship sailed through the pelagic waters of the Pacific Ocean.”

3. noun

the open sea, especially in deep water

“The ocean’s pelagic zone is vast and largely unexplored.”