OXFORD DICTIONARY
, 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
ROGET THESAURUS
Blueness
N
blueness, blue, garter-blue, watchet,
ultramarine, smalt, cobalt, cyanogen, Prussian blue, syenite blue, bice, indigo, zaffer, lapis lazuli, sapphire, turquoise, indicolite, blueness, bluishness, bloom, blue, azure, cerulean, sky-blue, sky-colored, sky-dyed, cerulescent, powder blue, bluish, atmospheric, retiring, cold.