Pronunciation (UK) IPA (key): /djuːn/ or /dʒuːn/ (US) (Canada) IPA (key): /dun/ Audio (UK)(file) Noun Singular dune Plural dunes (countable) A dune is a hill of sand that was piled up by the wind. When you walk through the desert, you walk over many dunes.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads