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seif dune(sāf, sīf)
See longitudinal dune.
[Arabic sayf, sword, from Aramaic saypā, of Egyptian origin; akin to Coptic sēfe, sword, from Egyptian sft, from earlier zft.]
(Physical Geography) (in deserts, esp the Sahara) a long ridge of blown sand, often several miles long
[seif, from Arabic: sword, from the shape of the dune]