WordReference Random House Unabridged Dictionary of American English © 2015
ben•thos  (benthos), 
    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 benthic divi′sion, benthonic zone′. 
  • Greek bénthos depth (of the sea); akin to bathos, bathy-
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::

benthos /ˈbɛnθɒs/, benthon n
  1. the animals and plants living at the bottom of a sea or lake
Etymology: 19th Century: from Greek: depth; related to bathus deep

ˈbenthic, ˈbenthal, benˈthonic adj

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