Partly from a dialectal form of down; and partly from French dune (from Old French dune), or from Middle Dutch dūne (modern Dutch duin), or from Middle Low German dûne; all ultimately from Proto-Germanic *dūnǭ, probably from Gaulish dunum ("hill"), from Proto-Celtic *dūnom ("stronghold, rampart"), from Proto-Indo-European *dʰuHnom ("enclosure"), from *dʰewh₂-. down (which see).
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