A very strong metal made mostly from iron and a small amount of carbon, used in buildings, tools, and machines.
From Old English “stēl,” referring to hardened iron. The idea of specially treated iron developed into what we now call steel, a carefully controlled alloy.
Steel is basically ‘upgraded iron’—a tiny bit of carbon makes it dramatically stronger and more useful. Our skyscrapers, cars, and bridges literally depend on this tiny chemical tweak.
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