Nemam odgovor na nepravilno postaljeno pitanje. Jel ti mene pitas da ti dam izvor da je rijec "Vlah" slovenskog porijekla, ili da su Vlasi slovenskog porijekla? Budi malo precizniji...
Imaš lep naučni rad Marka Pijovića.
http://oxford.academia.edu/MarkoPijović
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Postovani publikume pogldajte molim vas sta radi savremena srpska nauka. "les" je rijec njemackog porijekla, kazu, po njemackom "loss".
https://sr.wikipedia.org/sr/Лес
"Лес (нем. Löss) је седиментна, лако порозна, лапоровита или глиновита стена. Јавља се у слојевима значајне дебљине, од неколико до 100-200 метара. Карактеристична је за степске пределе Европе. Лес је настао навејавањем за време плеистоцена.
Простире се највише у Србији, Мађарској, Украјини и Русији, као и у Кини."
Pa pobogu dosli Njemci u Srbiju da daju ime 'les" za ono sto samo u Srbiji i ostalom vascelikom slovenskom svijetu ima. (Ne racunajuci Kinu). Ovo je za sprdnju. Ovo treba javno na terazijama objesiti da cio narod vidi i za buduca pokoljenja da se niko ne usudi da pise ovakve nistarije.
Les je srpska ili slovenska reč za drvo. Ali teško da su su Srbi razvili geologiju pre Nemaca. Poljoprivredu da, ali geologiju - ne. Značenje reči - rastresit.
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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; see
loose (adj.)). Related: Loessial.
loose (adj.) early 13c., lous, loos, lowse, "not securely fixed;" c. 1300, "unbound, not confined," from Old Norse lauss "loose, free, unencumbered; vacant; dissolute," cognate with Old English leas "devoid of, false, feigned, incorrect" (source of
-less) from Proto-Germanic *lausaz (source also of Danish løs "loose, untied," Swedish lös "loose, movable, detached," Middle Dutch, German los "loose, free," Gothic laus "empty, vain"), from PIE *leu- (1) "to loosen, divide, cut apart" (see
lose).
Meaning "not clinging, slack" (of clothes, etc.) is from mid-15c. Meaning "not bundled" is from late 15c. Sense of "unchaste, immoral" ("lax in conduct, free from moral restraint") is recorded from late 15c. Meaning "at liberty, free from obligation" is 1550s. Sense of "rambling, disconnected" is from 1680s. As an adverb, "loosely," from 1590s. A loose end was an extremity of string, etc., left hanging; hence something unfinished, undecided, unguarded (1540s); to be at loose ends is from 1807. Phrase on the loose "free, unrestrained" is from 1749 (upon the loose). Colloquial hang loose is from 1968.
