jettya. Made of jet, or like jet in color.()The people . . . are of a jetty. (Sir T. Browne.)n.[F. jete a pier, a jetty, a causeway. See Jet a shooting forth, and cf. Jutty.]()1. (Arch.) A part of a building that jets or projects beyond the rest, and overhangs the wall below.()2. A wharf or pier extending from the shore.()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.()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.()v. i. To jut out; to project.(Florio.)