A large silver coin that was used in Spanish-speaking countries, or the Spanish word for 'hard' or 'tough.'
From Spanish 'duro,' meaning 'hard' or 'harsh,' derived from Latin 'durus.' The coin sense comes from the silver peso duro that became famous in international trade, particularly in the Americas and Asia.
The Spanish silver duro became so valuable in trade across the Pacific that Chinese merchants literally called it 'silver hard'—and this single Spanish coin influenced global currency systems for centuries, including the U.S. dollar's origins.
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