The Collaborative International Dictionary of English v.0.48:
Sky-blue \Sky"-blue\, a. Having the blue color of the sky; azure; as, a sky-blue stone. --Wordsworth. [1913 Webster]WordNet (r) 3.0 (2006):
sky-blue adj 1: of a deep somewhat purplish blue color similar to that of a clear October sky; "October's bright blue weather" [syn: azure, cerulean, sky-blue, bright blue] n 1: a light shade of blue [syn: azure, cerulean, sapphire, lazuline, sky-blue]