n. & adj.
n. 1 a a brilliant blue pigment orig. obtained from lapis lazuli. b an imitation of this from powdered fired clay, sodium carbonate, sulphur, and resin. 2 the colour of this.
adj. 1 of this colour. 2 archaic situated beyond the sea.
[ obs. It. oltramarino & med.L ultramarinus beyond the sea (as ULTRA-, MARINE), because lapis lazuli was brought from beyond the sea ]