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Definition of sand dune noun from the Oxford Advanced Learner's Dictionary

sand dune

noun
 
/ˈsænd djuːn/
 
/ˈsænd duːn/
(also dune)
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  1. a small hill of sand formed by the wind, near the sea or in a desertTopics Geographyb2
See sand dune in the Oxford Advanced American Dictionary
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