loess noun. ['lǝʊɪs, lǝ:s] M19.
[German Löss from Swiss German lösch loose, from lösen loosen.]
Geology. A fine yellowish-grey loam composed of material transported by the wind during and after the glacial period which forms extensive deposits from north central Europe to eastern China, in the American Midwest, and elsewhere.

■ loessial,

■ loessic adjectives composed of loess E20.

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