Etymology
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loess (n.)
1833 (in Lyell), "unstratified deposit of loam," a special use from 1823 by German mineralogist Karl Cäsar von Leonhard (1779-1862) of German Löss "yellowish-gray soil," of a type found in the Rhine valley, from Swiss German lösch (adj.) "loose" (compare German los, from Proto-Germanic *lausaz, from PIE root *leu- "to loosen, divide, cut apart." Related: Loessial.
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*leu- 
Proto-Indo-European root meaning "to loosen, divide, cut apart."

It forms all or part of: absolute; absolution; absolve; analysis; analytic; catalysis; catalyst; catalytic; dialysis; dissolve; electrolysis; electrolyte; forlorn; Hippolytus; hydrolysis; -less; loess; loose; lorn; lose; loss; Lysander; lysergic; lysis; -lysis; lyso-; lysol; lytic; -lytic; palsy; paralysis; pyrolusite; resolute; resolution; resolve; soluble; solute; solution; solve; solvent.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit lunati "cuts, cuts off," lavitram "sickle;" Greek lyein "to loosen, untie, slacken," lysus "a loosening;" Latin luere "to loose, release, atone for, expiate;" Old Norse lauss "loose, free, unencumbered; vacant; dissolute;" Old English losian "be lost, perish."
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