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seif dune

(in deserts, esp the Sahara) a long ridge of blown sand, often several miles long
Word Origin
seif, from Arabic: sword, from the shape of the dune
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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seif dune in Science
seif dune
  (sāf, sīf)   
A sharp-crested longitudinal sand dune or chain of sand dunes common to the Sahara and ranging up to 300 m (984 ft) in height and 300 km (186 mi) in length.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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