Jetty/ˈdʒeti/ Definition 1 of 2Pro Tip 1/3Water Structure A jetty is a man-made structure used around bodies of water. The old jetty at the harbor is a popular spot for anglers. Pro Tip 2/3Purpose Specific Jetties can be designed for docking boats, fishing, or even sightseeing. Tourists gathered at the jetty to watch the cruise ship depart. Pro Tip 3/3Material Insight Jetties can be made of wood, concrete, or stone, depending on their use and location. The wooden jetty creaked as visitors strolled along it.