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English definition of “loess”

loess

noun [U] uk   /ˈləʊ.es/ us    /ˈloʊ-/ specialized
a type of light brown or greyish soil, consisting of very small pieces of quartz and clay, that is blown and left behind by the windSoil
(Definition of loess from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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