The pure bright blue of the sapphire.

(a) n. a brilliant blue colour resembling that of the plumage of a halcyon or common kingfisher; (b) adj. of this shade of blue; = kingfisher blue n.…

(a) n. a brilliant blue colour resembling that of a kingfisher; (b) adj. of this colour.

Used to form the names of colours obtained by new techniques, esp. new blue n. and adj.