'Sublittoral' definitions:

Definition of 'sublittoral'

(from WordNet)
adjective
Of or relating to the region of the continental shelf (between the seashore and the edge of the continental shelf) or the marine organisms situated there

Definition of 'Sublittoral'

From: GCIDE
  • Sublittoral \Sub*lit"to*ral\, a. Under the shore. --Smart. [1913 Webster]