(a.) Sky-colored; blue; azure.

Caelus air azure azure-blue azure-colored azurean azured azureous beryl-blue berylline blue blue sky bluish caelum canopy canopy of heaven ceruleous cerulescent cope cyanean dark-blue deep-blue empyrean ether firmament heaven heavens hyaline lift lifts light-blue lightish-blue livid pavonian pavonine peacock-blue sapphire sapphirine sky sky-blue sky-colored sky-dyed starry heaven the blue the blue serene turquoise vault vault of heaven welkin