Dūne, n.

n. [A-S. dûn, Ir. & Gael. dun. See DOWN, a bank of sand.] A low hill of sand accumulated on a sea-coast.

Three great rivers, the Rhine, the Meuse, and the Scheld, had deposited their slime for ages among the dunes or sand-banks heaved up by the ocean around their mouths. Motley.