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benthos (n.)

"life forms of the deep ocean and sea floor," 1891, coined by Haeckel from Greek benthos "depth of the sea," which is related to bathos "depth," bathys "deep, high;" which probably is Indo-European but of unknown origin. Adjective benthal is attested from 1877; benthic is attested from 1902.

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Definitions of benthos

benthos (n.)
a region including the bottom of the sea and the littoral zones;
Synonyms: benthic division / benthonic zone
benthos (n.)
organisms (plants and animals) that live at or near the bottom of a sea;
From wordnet.princeton.edu