sublittoral adjective 1noun 1forms 1 adjective1 •In the portion of the littoral zone (the shore) that is permanently but shallowly inundated (water-covered).Fortunately, good seaweeding can also be done when the tide is not low, for frequently one encounters piles of drifted seaweeds cast up on the sand from the sublittoral region. — 1966 noun1 •The sublittoral area, just beyond (and lower-lying than) the portion of the shore that is not always inundated (water-covered). formssublittorals
