The Collaborative International Dictionary of English v.0.48:

Azure \Az"ure\ (?; 277), a. [F. & OSp. azur, Sp. azul, through
   Ar. from Per. l[=a]jaward, or l[=a]juward, lapis lazuli, a
   blue color, l[=a]jaward[imac], l[=a]juward[imac], 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.
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   Azure stone (Min.), the lapis lazuli; also, the lazulite.
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The Collaborative International Dictionary of English v.0.48:

Azure \Az"ure\, n.
   1. The lapis lazuli. [Obs.]
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   2. The clear blue color of the sky; also, a pigment or dye of
      this color. "In robes of azure." --Wordsworth.
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   3. The blue vault above; the unclouded sky.
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            Not like those steps
            On heaven's azure.                    --Milton.
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   4. (Her.) A blue color, represented in engraving by
      horizontal parallel lines.
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The Collaborative International Dictionary of English v.0.48:

Azure \Az"ure\, v. t.
   To color blue.
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WordNet (r) 3.0 (2006):

azure
    adj 1: of a deep somewhat purplish blue color similar to that of
           a clear October sky; "October's bright blue weather"
           [syn: azure, cerulean, sky-blue, bright blue]
    n 1: a light shade of blue [syn: azure, cerulean,
         sapphire, lazuline, sky-blue]
    v 1: color azure; "Morning azured the village"