*dyew-^[1]

1. to bebright, toshine
2. sky,heaven

Some derivations have undergonemetathesis of the root, giving*deyw-.

• *dyḗws
• *dyutkós(“celestial, heavenly”) (+*tek-(“to obtain, receive”))
  • Proto-Indo-Iranian:*dyukšás
    • Proto-Indo-Aryan:*dyukṣás
      • Vedic Sanskrit:द्युक्ष(dyukṣá)
• *deyn-o-s(“day”) (probably a back-formation from*deywós, interpreting*dey- as the root)
  • Proto-Albanian:*deina
    • Albanian:din(“to break (of dawn)”)
  • Proto-Balto-Slavic:*deinas,*dinas
    • Latgalian:dīna
    • Latvian:diena
    • Lithuanian:diena
    • Old Prussian:dēinā
    • Samogitian:dėina
    • Proto-Slavic:*dьnь (see there for further descendants)
  • Proto-Germanic:*tīnaz (see there for further descendants)
  • Proto-Indo-Iranian:*dinám
    • Proto-Indo-Aryan:*dinám
      • Sanskrit:दिन(diná) (see there for further descendants)
  • Proto-Italic:*dinos
    • ⇒ Latin:nūndinus,perendinus
• *deywós
• *déywih₂
• *diwyós
• *d(i)wi-n-(possibly)
  • Proto-Armenian:
    • Old Armenian:երկինք(erkinkʻ)
• Unsorted formations:
  • Proto-Anatolian:*Diw-ōt-s
    • Hittite:[script needed](šiwatt-,“day”)
    • Luwian:[script needed](Tiwaz),[script needed](Tiwad-,“theonym”)
    • Palaic:[script needed](Tiyaz),[script needed](Tiyad-,“theonym”)
    • ⇒ Lycian:Τευδιαρμα(“Sun-Moon, given name”)
    • ⇒ Lydian:𐤯𐤦𐤰𐤣𐤠𐤩𐤦𐤳(tiudališ,“given name”)
  • Proto-Celtic:*dīyos (see there for further descendants)
  • Proto-Slavic:*diviti (see there for further descendants)
  • Proto-Anatolian:
    • Hittite:𒅆𒌦𒅀𒋻(/⁠šiuniyatar⁠/,“divine image, divinity”)
  • Proto-Indo-Iranian:*dyú,*diwám,*dyáwš
    • Proto-Indo-Aryan:*dyú,*diwám,*dyáwṣ
      • Sanskrit:द्यु(dyú),दिव(divá,“sky, heaven”),द्यो(dyó,“heaven”)
    • Proto-Iranian:*dyú,*diwám,*dyáwš
      • Sogdian:ܠܝܘܐܟܟ(δēwāk,“heavenly”),ܠܝܘܮܘܢ(δēwγōn,“heavenly”)
      • ⇒ Persian:لیو(liv,“sun”)(δēwāk > *lēwāk > lēw > lēv > līv)(perhaps)^[2]
    • ⇒ Proto-Indo-Iranian:*dyumā́
      • Sanskrit:द्युमान्(dyumān)
      • → Proto-Uralic:*juma^[3]

• Sihler, Andrew L. (1995)New Comparative Grammar of Greek and Latin, Oxford, New York: Oxford University Press,→ISBN
• Pokorny, Julius (1959)Indogermanisches etymologisches Wörterbuch [Indo-European Etymological Dictionary] (in German), Bern, München: Francke Verlag