n.; pl.Jetties [ F. jetée a pier, a jetty, a causeway. See Jet a shooting forth, and cf. Jutty. ] [ 1913 Webster ]
1. (Arch.) A part of a building that jets or projects beyond the rest, and overhangs the wall below. [ 1913 Webster ]
2. A wharf or pier extending from the shore. [ 1913 Webster ]
3. (Hydraul. Engin.) 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. [ 1913 Webster ]
Jetty head (Naut.), a projecting part at the end of a wharf; the front of a wharf whose side forms one of the cheeks of a dock. [ 1913 Webster ]
(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