A crescent-shaped sand dune with curved horns pointing in the direction of prevailing winds, found in deserts.
From Russian 'barkhan' or Kazakh/Turkic languages, referring to sand formations in Central Asian deserts. The word traveled into European scientific language through 19th-century geographical studies of Asian steppes.
Barkhans are nature's perfect aerodynamic shapes—they migrate across deserts at speeds of up to 100 feet per year, essentially 'walking' with the wind like slow-motion animals. Understanding them helped engineers design better aircraft wings.
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