benthos

noun
ben·thos | \ˈben-ˌthäs \

Definition of benthos 

: organisms that live on or in the bottom of a body of water

First Known Use of benthos

1891, in the meaning defined above

History and Etymology for benthos

New Latin, from Greek, depth, deep sea; akin to Greek bathys deep

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The first known use of benthos was in 1891

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