tuule setteid kuhjava tegevuse tagajärjel tekkinud ebasümmetrilise ristlõikega (tuulepealne/proksimaalne nõlv alati laugem) piklik, positiivne, liivast pinnavorm, mille suurus ja kuju sõltub tuule suunast ja tugevusest ning setete olemasolust, terasuurusest ja niiskusastmest
is a hill of sand built by wind with characteristic gentle windward slope where the sand is pushed up the dune and steep "slip face" in the lee of the wind; shape and measures vary due to wind characteristics, presence-, grain-size and moisture conditions of the sediments; dune classification follows the shape and orientation and includes: crescentic or transverse or barchan type; linear-, star-, dome-, parabolic-, longitudinal dunes. Primary sand mounds or ridges being incipient dunes are called foredunes.
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Vastavalt kujule jaotatakse: kaarluited, paraboolluited, seljakluited, püramidaalsed luited, vallluited, peenarluited. Mitmesuguse kujuga primaarseid liivakuhjatisi nimetatakse eelluideteks ja nendest võivad aja jooksul kujuneda suuremate mõõtmetega luited.
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