Dune/duːn/ Definition 1 of 4Pro Tip 1/3Visual Imagery Use 'dune' to describe scenes vividly, creating a mental picture of landscapes. The sun cast long shadows over the majestic dunes. Pro Tip 2/3Natural Creation 'Dune' emphasizes the natural creation of hills by wind, not by water or other means. Wind patterns shape the ever-changing dunes. Pro Tip 3/3Size Varies Dunes can range widely in size, from small to large scale structures. Small dunes bordered the beach, leading into giant ones further inland.