[loh-es, les, luhs]
- a loamy deposit formed by wind, usually yellowish and calcareous, common in the Mississippi Valley and in Europe and Asia.
Origin of loess
1825–35; < German Löss < Swiss German lösch loose, slack (sch taken as a dial. equivalent of German s), akin to German lose loose
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a light-coloured fine-grained accumulation of clay and silt particles that have been deposited by the wind
C19: from German Löss, from Swiss German dialect lösch loose
Word Origin and History for loessial
1833 (in Lyell), "unstratified deposit of loam," coined 1823 by German mineralogist Karl Cäsar von Leonhard (1779-1862) from German Löss "yellowish-gray soil," from Swiss German lösch (adj.) "loose" (cf. German los; see loose). Related: Loessial.
Online Etymology Dictionary, © 2010 Douglas Harper
[lō′əs, lĕs, lŭs]
- A very fine grained silt or clay, thought to have formed as the result of grinding by glaciers and to have been deposited by the wind. Most loess is believed to have originated during the Pleistocene Epoch from areas of land covered by glaciers and from desert surfaces.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.