pelagic /pəˈlæd͡ʒɪk/adjective 2noun 1forms 3 adjective2 •Living in the open sea rather than in coastal or inland waters.Besides, seeing a shark in an aquarium tank is not the same as seeing a shark in the wild, in its natural, pelagic habitat. — 1983 •Of or pertaining to oceans. noun1 •Any organism that lives in the open sea rather than in coastal or inland waters. formspelagics · more pelagic · most pelagic