Definitions for "Benthos"
The bottom of the sea, esp. of the deep oceans;
the fauna and flora of the sea bottom; -- opposed to plankton.
The whole group of organisms in a water body (pond, lake, or river) which crawl about on the bottom, or burrow into the bottom, or grow attached to the bottom. Those aquatic organisms that are carried passively by water currents or the wind are termed plankton and those that swim actively and may move long distances for feeding or breeding purposes, nekton.
Keywords:  steth, vav
VaV Steth
Encyclopaedia Britannica 2002
Keywords:  seafloor
the seafloor.