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The character 礌 is structured with the semantic radical 石, indicating its relation to stone, and the component 畾, which functions phonetically for léi while implying a sense of repetition or accumulation. Etymologically, this construction reflects the character's original meaning of stones piled or rolled for defensive purposes, as seen in early military contexts like 礌石. Over time, its usage has consistently referred to such projectile stones, without broadening into other meanings or applications.