οὐρανός

• ὄρᾰνος (óranos) — Aeolic
• ὠρᾰνός (ōranós) — Doric, Boeotian

Of disputed origin, with multiple theories proposed:^[1]

• Perhaps from an older *(ϝ)ορσανός (*(w)orsanós), which may be related to Proto-Indo-European *h₁worseye-, from *h₁wers- (“rain”) (compare Sanskrit वर्षति (varṣati, “it rains”). Beekes appears to favor this derivation.
• From Proto-Indo-European *wers- (“to rise, protrude”), and compared to Lithuanian viršùs (“top, upper”), Sanskrit वर्ष्मन् (varṣman, “height, top”). This is not favored by Beekes.
• From Proto-Indo-European *h₁wer- (“broad”), and compared with Sanskrit वरुण (váruṇa, “sea god”) and अर्णव (arṇava, “ocean”). This is categorically rejected by Beekes.
• Based on the infix -αν- (-an-), which is difficult to explain as an old Indo-European formation, perhaps Pre-Greek; however, as the sky was very important to Indo-European groups, it is unlikely that a non-Indo-European formation for "sky" would become the dominant word in an Indo-European language.

A folk etymology advanced by Aristotle interpreted it as ὅρος (hóros, “limit”) and ἄνω (ánō, “up”).

οὐρᾰνός • (ouranós) m (genitive οὐρᾰνοῦ); second declension

1. the vaulted sky, on which the stars were attached and the sun traveled: sky, heaven
2. the region above this vault, the home of the gods
3. (philosophy) the universe
4. anything shaped like the sky: vaulted ceiling, tent

• Greek: ουρανός (ouranós)
• Mariupol Greek: урано́с (uranós), урано́ (uranó)

• “οὐρανός”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
• “οὐρανός”, in Liddell & Scott (1889) An Intermediate Greek–English Lexicon, New York: Harper & Brothers
• “οὐρανός”, in Autenrieth, Georg (1891) A Homeric Dictionary for Schools and Colleges, New York: Harper and Brothers
• οὐρανός in Bailly, Anatole (1935) Le Grand Bailly: Dictionnaire grec-français, Paris: Hachette
• Bauer, Walter et al. (2001) A Greek–English Lexicon of the New Testament and Other Early Christian Literature, Third edition, Chicago: University of Chicago Press
• οὐρανός in Cunliffe, Richard J. (1924) A Lexicon of the Homeric Dialect: Expanded Edition, Norman: University of Oklahoma Press, published 1963
• “οὐρανός”, in Slater, William J. (1969) Lexicon to Pindar, Berlin: Walter de Gruyter
• G3772 in Strong, James (1979) Strong’s Exhaustive Concordance to the Bible
• οὐρανός in Trapp, Erich, et al. (1994–2007) Lexikon zur byzantinischen Gräzität besonders des 9.-12. Jahrhunderts [the Lexicon of Byzantine Hellenism, Particularly the 9th–12th Centuries], Verlag der Österreichischen Akademie der Wissenschaften
• Woodhouse, S. C. (1910) English–Greek Dictionary: A Vocabulary of the Attic Language‎, London: Routledge & Kegan Paul Limited.
  • air idem, page 21.
  • firmament idem, page 322.
  • heaven idem, page 393.
  • palate idem, page 589.
  • sky idem, page 781.
  • uranus idem, page 939.
  • weather idem, page 971.
  • welkin idem, page 973.