1. Relating to, living near, or located in the shallow water near a shoreline.
2. The area of a sea that lies between the shore and the continental shelf.
3. 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 feet (200 meters).
4. The marine zone extending from the lower margin of the intertidal (littoral) to the outer edge of the continental shelf at a depth of about 660 feet or 200 meters; sometimes used for the zone between low tide and the greatest depth to which photosynthetic pants can grow.
5. The deeper zone of a lake below the limit of rooted vegetation.
6. 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.

1. Designating or occurring in the shallow-water zone of a sea, over the continental shelf and below the low tide mark.
2. Designating or occurring in the zone of a lake below the littoral zone, to a depth of six to ten meters.