Azure describes a bright, clear blue color, like a deep blue sky on a sunny day. As a noun, it refers to this shade of blue itself.
From Old French “azur,” from Arabic “lāzaward,” meaning “lapis lazuli,” a deep blue stone, which came through Persian. The initial “l” dropped in French, leaving “azur” for the color.
Azure is literally the color of a gemstone—lapis lazuli—that was once more precious than gold. The sky you see for free every day used to be painted only with one of the most expensive pigments on earth.
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