Plural of duro; multiple silver coins from Spanish-speaking countries, or the Spanish word meaning multiple 'hard' things.
Simple Spanish plural of duro, formed by adding 's.' Used historically in commerce across Spanish colonies and trading routes.
When Spanish galleons sailed to the Philippines and China, they carried duros that became more trusted than local currency—so valuable that Chinese merchants counterfeited them, making Spanish coins a weird form of flattery in international trade.
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