Baltic 'autumn' words derived from the inherited word for 'red; reddish-brown': BSl. *roudos < PIE. *h₁roudh-o-. Also PSl. *rȗdъ adj. < BSl. *roudos < PIE. *h₁roudh-o- Rick Derksen. "rȗdъ" in: Etymological Dictionary of the Slavic Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2014. Brill Online. November 21, 2014. < http://iedo.brillonline.nl/dictionaries/lemma.html?id=19896 >
Robert Farren, PIE culture words collection, 2017
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