Of or pertaining to a shore, as of the sea or a great lake; frequenting or living near the shore: as, littoral trade; littoral fishes or vegetation.Situated or bordering on a shore: as, the Littoral Provinces (Litorale or Küstenland), a division of Austria on the east coast of the Adriatic.n. A littoral tract or region; the part of a country lying along the coast.