(n)a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away, Syn.bulwark, seawall, mole, groyne, groin, jetty
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
n. Any structure or contrivance, as a mole, or a wall at the mouth of a harbor, to break the force of waves, and afford protection from their violence. [ 1913 Webster ]