[doon, dyoon]
a sand hill or sand ridge formed by the wind, usually in desert regions or near lakes and oceans.

1780–90; < French, Old French < Middle Dutch dūna; cognate with down3

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World English Dictionary
dune (djuːn)
a mound or ridge of drifted sand, occurring on the sea coast and in deserts
[C18: via Old French from Middle Dutch dūne; see down³]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1790, from Fr., M.Du. or M.L.G., all of which had the word in similar form, all perhaps from Gaulish *dunom (thus related to down (n.2) and to town).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
dune  [%PREMIUM_LINK%]     (dn)  Pronunciation Key 

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A hill or ridge of wind-blown sand. Dunes are capable of moving by the motion of their individual grains but usually keep the same shape. See more at barchan dune, draa, longitudinal dune, seif dune, transverse dune.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In other places, material has been deposited by the wind to form hills and
We follow the boardwalk along the lake and then through the shifting dunes.
Both the living room and the kitchen, at opposite ends of the main space,
  overlook the dunes.
There, with residents running their dogs along the dunes, it's easy to
  understand how such natural opulence fuels inspiration.
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