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骶 is a phono-semantic compound consisting of the bone radical 骨 on the left, indicating the anatomical category, and the phonetic component 氐 on the right. Besides supplying the pronunciation, 氐 also suggests a base or foundation. Accordingly, the character refers to the sacrum, the bone that forms the base of the vertebral column, located just above the tailbone. This etymology reflects the sacrum's role as the foundational structure of the spine.
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