Welkin

Noun

 * 1)  The sky, the upper air; the heavens.
 * 2) firmament

Derived terms

 * make the welkin ring

Thesaurus
Caelus, aerosphere, air, atmosphere, azure, biosphere, blue sky, caelum, canopy, canopy of heaven, cerulean, cope, ecosphere, empyrean, ether, firmament, gaseous envelope, heaven, heavens, hyaline, lift, lifts, noosphere, sky, starry heaven, the blue, the blue serene, vault, vault of heaven