The mountains will become dunes of shifting sand.
-Quran 73:14
The Quranic word for dune here is Kathīb, defined by Lane as a Gibbous Hill of Sand, the English word Gibbous from the Latin Gibbus, meaning Hump, as in a Camel’s, Sanām in Arabic, which Lane gives in its superlative form, Asnama, in construct with the word Raml, Sand, to mean, the Most Elevated, or Humpiest, of the Sands.