Gr. ξῠ́λον n. 'wood'. Further etymology uncertain: possibly from a non-IE substrate language (RB). Robert Beekes (with the assistance of Lucien van Beek). "ξύλον" in: Etymological Dictionary of Greek. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2014. Brill Online. December 14, 2014. < http://iedo.brillonline.nl/dictionaries/lemma.html?id=7852 >
Robert Farren, PIE culture words collection, 2017
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