ridge a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters
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Wiktionary
Substantiv
dune -
A ridge or hill of sand piled up by the wind.
Wikipedia
A dune is a hill of sand built by aeolian processes. Dunes occur in different forms and sizes, formed by interaction with the wind. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind.
OmegaWiki Dictionary
Ω
dune A low mound, ridge, bank, or hill of loose, windblown granular material (generally sand, sometimes volcanic ash), either bare or covered with vegetation, capable of movement from place but always retaining its characteristic shape.