jetty > define

noun

• A protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away.
  • synonyms: breakwater, groin, groyne, mole, bulwark, seawall

• (n.) A wharf or pier extending from the shore.
• (v.i.) To jut out; to project.
• (n.) A structure of wood or stone extended into the sea to influence the current or tide or to protect a harbor; a mole; as, the Eads system of jetties at the mouth of the Mississippi River.
• (a.) Made of jet or like jet in color.
• (n.) A part of a building that jets or projects beyond the rest, and overhangs the wall below.