[sub.lit.to.ral] adj (1846) 1: situated, occurring, or formed on the aquatic side of a shoreline or littoral zone
2: constituting the sublittoral
[2]sublittoral n (ca. 1935): the deeper part of the littoral portion of a body of water: a: the region in a lake between the deepest-growing rooted vegetation and the part of the lake below the thermocline b: the region in an ocean between the lowest point exposed by a low tide and the margin of the continental shelf