seif dune  (sāf, sīf)  n. A sharp-crested longitudinal sand dune common to the Sahara and ranging up to 300 m (984 ft) in height and 300 km (186 mi) in length. [Arabic sayf, sword, from Aramaic saypā, of Egyptian origin; akin to Coptic sēfe, sword.] |
| seif dune (sāf, sīf) Pronunciation Key
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. |