G3772 οὐρανός (ouranós)

KJV renderings: air, heaven(-ly), sky
Strong's definition: the sky; by extension, heaven (as the abode of God); by implication, happiness, power, eternity; specially, the Gospel (Christianity)
Derivation: perhaps from the same as G3735 (ὄρος) (through the idea of elevation);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.