(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.
(n.) A wharf or pier extending from the shore.
(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.
(v. i.) To jut out; to project.