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铠, traditional form 鎧, is a phono-semantic compound denoting heavy protective armor for soldiers and horses. Its semantic component is the metal radical (钅 in simplified, 金 in traditional), indicating the armor was forged from iron, steel, or bronze. The phonetic component 岂 (simplified) / 豈 (traditional) provides the pronunciation kǎi. This character captures the historical shift from leather to metallic armor and remains the standard term for both historical suits and metaphorical defenses.
Etymology Hide
