райдуга

Ukrainian

Inherited from Proto-Slavic *radǫga. The first element more likely derives from Proto-Slavic *radъ than folk etymology’s Proto-Slavic *rajь. The second element from Proto-Slavic *dǫga would be cognate with Lithuanian dangùs (“sky, heaven”) and perhaps further Proto-Germanic *tunglą (“heavenly body”) together from a tentative Proto-Indo-European root *denǵʰ-.

Slavic cognates include Russian ра́дуга (ráduga).

A borrowing from Old Ossetic *ardunga- cognate with Classical Persian (durōna, “rainbow”) etc. is also possible.

ра́йдуга • (rájduha) f inan (genitive ра́йдуги, nominative plural ра́йдуги, genitive plural ра́йдуг)

Bilodid, I. K., editor (1970–1980), “райдуга”, in Словник української мови: в 11 т. [Dictionary of the Ukrainian Language: in 11 vols] (in Ukrainian), Kyiv: Naukova Dumka
“райдуга”, in Горох – Словозміна [Horokh – Inflection] (in Ukrainian)
Szemerényi, Oswald (1967) “Славянская этимология на индоевропейском фоне”, in В. А. Меркулова, transl., Вопросы языкознания (in Russian), number 4, page 23
Vasmer, Max (1964–1973) “ра́дуга”, in Oleg Trubachyov, transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language] (in Russian), Moscow: Progress
Bogatova, G. A., editor (1995), “радуга”, in Словарь русского языка XI–XVII вв. [Dictionary of the Russian Language: 11ᵗʰ–17ᵗʰ cc.] (in Russian), issue 21 (прочный – раскидати), Moscow: Nauka, →ISBN, page 126