Webster’s Revised Unabridged Dictionary · 1913
Azure
Az′ure, a. [F. & OSp. azur, Sp. azul, through Ar. from Per. lājaward, or lājuward, lapis lazuli, a blue color, lājawardī, lājuwardī, azure, cerulean, the initial l having been dropped, perhaps by the influence of the Ar. azr-aq azure, blue. Cf. G. lasur, lasurstein, azure color, azure stone, and NL. lapis lazuli.] Sky-blue; resembling the clear blue color of the unclouded sky; cerulean; also, cloudless.
Azure stone (Min.), the lapis lazuli; also, the lazulite.
Az′ure, n. 1. The lapis lazuli. [Obs.]
2. The clear blue color of the sky; also, a pigment or dye of this color. "In robes of azure." Wordsworth.
3. The blue vault above; the unclouded sky.
Not like those steps On heaven's azure. Milton.
4. (Her.) A blue color, represented in engraving by horizontal parallel lines.
Az′ure, v. t. To color blue.