zhū [Chinese 铢 / 銖 ]  

In China, Han Dynasty – 1621, a unit of mass = ¹⁄₂₄th of a lĭang. Often romanized as shu. In 621 it was replaced by the qian. The traditional form of the character is . Originally, at least in concept, the weight of 100 millet seeds. In the Western Han, about 640 to 650 milligrams.

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