📚 Barchan, noun. 🔉 /ˈbɑːk(ə)n/ 🇬🇧 ❓ Definition: A crescent-shaped shifting sand dune, as found in the deserts of Turkestan. ❗️ Examples: 1. Now a team publishing in the 23 December print issue of PRL reports it has generated miniature replicas of crescent-shaped dunes known as barchans in a water tank. 2. Transverse ridges have a higher sand supply than barchans but also exist in unidirectional winds. 3. As he described them to the nomads of the Empty Quarter, they thought of the hard dark dunes found in their own desert called barchan dunes. 4. The pace of an offensive in the desert depends to a great extent on how well the troops can overcome natural obstacles, especially barchans and solonchaks, rock outcrops covered by the enemy fire. ━━━━━━━━━━━━━ 🌀 @cambridge_dic