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early 14c., from Old French azur, asur, a color name, from a false separation of Arabic (al)-lazaward "lapis lazuli," as though the -l- were the French article l'. The Arabic name is from Persian lajward, from Lajward, a place in Turkestan, mentioned by Marco Polo, where the stone was collected.
azure az·ure (āzh'ər)
Any of various dyes used in biological stains, especially for blood and nuclear staining.