Seif

(1) A large sand dune that is elongated in the general direction of the dominant winds. (2) A sand dune formed by winds from multiple directions.
Found on http://www.physicalgeography.net/physgeoglos/s.html

seif

a long, narrow sand dune or chain of dunes, generally oriented in a direction parallel to the prevailing wind or in a direction resulting from two ...
Found on http://www.britannica.com/eb/a-z/s/59
No exact match found