benthic /ˈbɛnθɪk/adjective 1noun 1forms 1 adjective1 •Pertaining to the benthos; living on the seafloor, as opposed to floating in the ocean.The benthic environment, except for intertidal areas, has been scarcely explored[…] — 1878 noun1 •Any organism that lives on the seafloor. formsbenthics