/sub lit"euhr euhl/ , adj.
1. of or pertaining to the biogeographic region of the ocean bottom between the littoral and bathyal zones, from the low water line to the edge of the continental shelf, or to a depth of approximately 660 ft. (200 m).
2. being or situated in the zone of a lake extending from the lowest depth of rooted photosynthetic plants to the level at which the photosynthetic rate of flora equals the respiration rate.
n.
3. a sublittoral zone or region.
[ 1840-50; SUB- + LITTORAL ]