from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. 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 Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Relating to the ocean bottom, between the sublittoral and abyssal zones, at a depth of between 200 and 2000 metres
from the GNU version of the Collaborative International Dictionary of English
- adj. of or pertaining to bathymetry.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. relating to ocean depths between 200 and 2000 meters (corresponds to the continental slope)
Sorry, no etymologies found.
For information on the bottom topography (continental shelf, bathyal and abyssal zones), see Morgan, 1989.