adjective. Of, relating to, or living in open oceans or seas rather than waters adjacent to land or inland waters.

Specifically, in marine biol.: Living at the surface of the high sea at a distance from land.

Living at the surface of the sea. See the extract.

Living at the surface of the water, either salt or fresh.

Floating or swimming in the water, either at the surface or at any depth below it.

In geology and geography, of or pertaining to the deep ocean; far from land.

Marine; oceanic; of or inhabiting the deep or open sea: said of those aquatic plants and animals which inhabit the high seas. Also Pelagian.

adjective. Of or pertaining to the ocean; -- applied especially to animals that live at the surface of the ocean, away from the coast. Compare benthic.

adjective. Living in the open sea rather than in coastal or inland waters.

adjective. relating to or occurring or living in or frequenting the open ocean