denoting or relating to an ocean depth of between 200 and 2000 metres (about 100 and 1000 fathoms), corresponding to the continental slope
bathyal in American English
(ˈbæθiəl)
adjective
designating or of the ecological zone (bathyal zone) along the continental slope of the ocean floor between c. 100 and 2,000 fathoms (c. 180 and 3,650 m)