Saffron or a saffron-colored dye, derived from Arabic terminology for the precious spice used in cooking and textiles.
From Arabic 'az-za'farān' (the saffron), which likely comes from Persian roots; the 'az-' is the Arabic definite article 'al-' modified before 'z', and the word traveled into European languages through medieval trade routes.
Saffron is so expensive that it's literally worth more by weight than gold—it takes about 75,000 crocus flowers to produce just one pound, which is why medieval dyers used words like 'azafran' to describe this ultra-luxurious color.
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