οὐρανός

Etymology
Of disputed origin, with multiple theories proposed:
 * Perhaps from an older, which may be related to , from (compare 🇨🇬. Beekes appears to favor this derivation.
 * From, and compared to 🇨🇬, 🇨🇬. This is not favored by Beekes.
 * From, and compared with 🇨🇬 and . This is categorically rejected by Beekes.
 * Based on the infix, which is difficult to explain as an old Indo-European formation, perhaps ; 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 interpreted it as  and.

Noun

 * 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)  the universe
 * 4) anything shaped like the sky: vaulted ceiling, tent