A protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away. Synonyms:breakwater, bulwark, groin, groyne, jetty, mole.
... launch plied lay inside a seawall inclosing a small placid rectangle with a walk all about and iron benches. Steps at the back, guarded by two great Pompeian sandstone urns, and pressed by a luxuriant growth, led up to the villa. Gheta looked curiously about as she stepped from the launch and ... — The Happy End • Joseph Hergesheimer
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