κύανος

Etymology
According to Beekes, probably from, of origin.

Noun

 * 1) dark blue enamel, especially used to adorn armour
 * 2)  lapis lazuli
 * 3)  azurite
 * 4) blue copper carbonate
 * 5) cornflower
 * 6) blue rock thrush
 * 7)  blue or a shade of blue