WordReference Random House Unabridged Dictionary of American English © 2025
ben•thos  (ben′thos),USA pronunciation n. 
  1. Ecologythe biogeographic region that includes the bottom of a lake, sea, or ocean, and the littoral and supralittoral zones of the shore. Also called ben′thic divi′sion, benthon′ic zone′. 
  • Greek bénthos depth (of the sea); akin to bathos, bathy-
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::
benthos / ˈbɛnθɒs/, benthon
  1. the animals and plants living at the bottom of a sea or lake
Etymology: 19th Century: from Greek: depth; related to bathus deepˈbenthic, ˈbenthal, benˈthonic
'benthonic' also found in these entries (note: many are not synonyms or translations):
benthic

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