bathyal

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of or relating to the region of the ocean bottom between the sublittoral and abyssal zones, from depths of 200 to 4,000 meters (660 to 13,000 feet).

from the GNU version of the Collaborative International Dictionary of English.

• adjective of or pertaining to bathymetry.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Relating to the ocean bottom, between the sublittoral and abyssal zones, at a depth of between 200 and 2000 metres

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective relating to ocean depths between 200 and 2000 meters (corresponds to the continental slope)