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碡 is the second character in the compound 碌碡 (lùzhou), which names a heavy cylindrical stone roller used in traditional agriculture for leveling threshing floors and crushing harvested grain. It is a phono-semantic compound: the left-hand stone radical 石 places it in the semantic category of rocks, stone implements, and masonry; the right-hand component 毒 (dú) functions purely as a phonetic marker and does not bring its meaning of poison into this character. The character's structure mirrors the stone material of the tool it represents, and it is found almost exclusively in this rural farming term.
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