- of or relating 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 feet (200 meters).
- 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.
- a sublittoral zone or region.
- (of marine organisms) growing, living, or situated close to the seashore
- of or relating to the zone between the low tide mark and 100 m depth
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