сойка

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со́йка • (sójka) f animal (genitive со́йкі, nominative plural со́йкі, genitive plural со́ек)

1. jay (bird)

Bulgarian Wikipedia has an article on:

Сойка

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From Proto-Slavic *sojьka. Morphologically equivalent to со́а (sóa) (dialectal) +‎ -ка (-ka).

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со́йка • (sójka) f

1. jay (bird of genus Garrulus (for Old World jays) or Cyanocitta (for New World jays))

• со́а (sóa) — dialectal variant of an earlier *soja
• со́кер m (sóker), со́кa f (sóka)

• еврази́йска со́йка (evrazíjska sójka, “Eurasian jay, Garrulus garrulus”)
• си́ня со́йка (sínja sójka, “blue jay, Cyanocitta cristata”)

• сое (soe, “lighted place”) (obsolete)
  • усо́е (usóe, “shady place”)
  • присо́е (prisóe, “sunny place”)
• со́йна (sójna, “adder (snake)”) (dialectal)
• со́керица (sókerica, “spotted nutcracker”)

• “сойка”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “сойка”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010
• Todorov, T. A., Racheva, M., editors (2010), “сойка¹”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volume 7 (слòво – теря̀свам), Sofia: Prof. Marin Drinov Pubg. House, →ISBN, page 286

Russian Wikipedia has an article on:

сойка

Wikipedia ^ru

Inherited from Proto-Slavic *sojьka. By surface analysis, со́я (sója, “jay (dialectal)”) +‎ -ка (-ka). Cognate with Ukrainian со́я (sója), Belarusian со́я (sója), Bulgarian со́йка (sójka), Serbo-Croatian со̑јка, Slovene sȏjka (“type of jackdaw”) (tonal orthography), Czech sojka (“jay”), Slovak sojka (“jay”), Polish soja (also sójka), Upper Sorbian soja. Per Vasmer, presumably related to Russian сия́ть (sijátʹ, “to shine”), based on the colorful feathers.

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со́йка • (sójka) f anim (genitive со́йки, nominative plural со́йки, genitive plural со́ек)

1. Eurasian jay (Garrulus glandarius)

• Vasmer, Max (1964–1973) “сойка”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress

Ukrainian Wikipedia has an article on:

сойка

Wikipedia ^uk

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со́йка • (sójka) f animal (genitive со́йки, nominative plural со́йки, genitive plural со́йок)

1. jay (bird)

• Bilodid, I. K., editor (1970–1980), “сойка”, in Словник української мови: в 11 т. [Dictionary of the Ukrainian Language: in 11 vols] (in Ukrainian), Kyiv: Naukova Dumka