barchan
/bɑrˈkɑn/
noun
- A crescent-shaped sand dune that moves across a desert, with its horns pointing downwind.
- Geologists studied the barchan to understand how sand moves in arid regions.
- From the airplane, the barchan looked like a giant crescent moon made of sand.
- The desert was covered with barchan dunes that shifted slowly with the wind.