köken: Inherited from Old East Slavic зълчь (zŭlčĭ) (rarer жълчь (žŭlčĭ)), from Proto-Slavic *zьlčь (“bile”), from Proto-Balto-Slavic *źulʔ-, from Proto-Indo-European *ǵʰlh₃-. Related to *zelenъ and was under the influence of *žьltъ.
köken: Inherited from Middle Persian [script needed] (zʾhlk' /zahrag/, “gall; bile”), suffixed from Proto-Iranian *jarHáH, from Proto-Indo-European *ǵʰolh₃-éh₂. Compare Avestan 𐬰𐬁𐬭𐬀 (zāra, “gall”), Northern Luri زںڵںە (zəłə), Ancient Greek χολή (kholḗ, “gall; bile”), Old English ġealla (“gall”), whence English gall.
köken: Inherited from Chagatai اوت (ōt, “fire”), from Proto-Turkic *ōt (“fire”). Cognate with Turkish and Azerbaijani od, Turkmen ōt, and Kazakh от (ot).
köken: From Proto-Uralic *säppä. Cognates include Finnish sappi, Estonian sapp and Erzya сэпе (sëpe). Its current form is the result of rebracketing an earlier form *ep possessive-suffixed with -e, compare vese, zúza, ipa, and possibly apa.
Uncertain. Either from Proto-Indo-European *ǵʰelh₃- (“green”), or from *bʰel-, *bʰl̥H- (“yellow”). *ǵʰ- > f- instead of the expected *h- is explained as being regular in some dialects. Cognates through the first etymon include holus and helvus; Ancient Greek χολή (kholḗ, “bile”) and χλωρός (khlōrós, “green”); and English yellow and gold.