Dictionary.com
Thesaurus.com

draa

American  
[drah] / drɑ /

noun

plural

draas
  1. Physical Geography. a very large sand dune, especially a long one, sometimes dozens of miles long, several miles wide, and several hundred feet high.


draa Scientific  
/ drä /
  1. A large dune measuring up to several hundred kilometers in length and hundreds of meters in height. Smaller dunes often form on their leeward and windward faces.