breakwater

Noun

Synonyms: groin groyne mole bulwark seawall jetty

WordNet 3.0

Noun (1)

a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing awaySynonyms: groin groyne mole bulwark seawall jetty

Webster's Dictionary (GCIDE)

Breakwater \Break"wa`ter\, 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]