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.
Etymology: obs. It. oltramarino & med.L ultramarinus beyond the sea (as ULTRA-, MARINE), because lapis lazuli was brought from beyond the sea