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Connections with σπαίρω(spaírō, “to gasp”) or Proto-Indo-European*sperH-(“to kick, rebound, move convulsively”, the original sense would be "something that rebounds") have been suggested, but the aspiration of σπ- to σφ- is unexplained and the semantic development is dubious.[1][2] Nikolayev instead suggests derivation from a Proto-Hellenic*skʷʰə́řřa, from a putative Proto-Indo-European*sgʷʰer-(“to be round”); compare Avestan𐬰𐬔𐬆𐬭𐬆𐬯𐬥𐬀(zgərəsna, “round”) and Hittitepl(/šū̆rita/, “skeins of wool”) (a borrowing from Luwian).[3]
^ Roberts, Edward A. (2014) A Comprehensive Etymological Dictionary of the Spanish Language with Families of Words based on Indo-European Roots, Xlibris Corporation, →ISBN, page 906
^ Alexander Nikolaev (2017) “Luvian (síg)šūrita ‘balls of yarn’”, in Usque ad Radices: Indo-European studies in honour of Birgit Anette Olsen, Museum usculanum Press, pages 567-574
“σφαῖρα”, in ΛΟΓΕΙΟΝ Dictionaries for Ancient Greek and Latin (in English, French, Spanish, German, Dutch and Chinese), University of Chicago, since 2011