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(noun) - a tower built on the coast that has a bright light in the top of it so ships can see it from a long way away. The light helps sailors know not to go too close to a rocky shore, so they didn't crash. Lighthouses were also used to mark the entrance to a harbor so ships could find where they were going at night.

Black and white striped lighthouse.

Bodie Island and Cape Hatteras Lighthouse, North Carolina. Image courtesy of the National Park Service