This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A hill or ridge of wind-blown sand.

n. A ridge or hill of sand piled up by the wind.

n. A low hill of drifting sand usually formed on the coats, but often carried far inland by the prevailing winds.

n. A mound, ridge, or hill of loose sand, heaped up by the wind on the sea-coast, or rarely on the shore of a large lake, as on Lake Superior.

n. An ancient fort with a hemispherical or conical roof.

n. a ridge of sand created by the wind; found in deserts or near lakes and oceans

"In effect, he cannot tell a sand dune from a sandworm."

dike    dyke   

ridge   

wandering dune    sea dune    land dune    gray dune    active dune    white dune    barrier dune   

dun   

seif dune   

dunesand   

sand dune    sand-dune   

Bethune    Boone    Calhoun    June    Karun    Kuhn    Moon    Noone    Rangoon    Sassoon   

bluff    ridge    crag    canyon    plateau    boulder    hillside    headland    hillock    knoll