About
The character 骶 is a phono-semantic compound with the bone radical 骨 on the left, indicating its anatomical category, and the phonetic component 氐 on the right, which also implies a base or foundation. As an anatomical term, it specifically denotes the sacrum, the bone at the base of the spine just above the tailbone. This structure effectively captures its definition as the foundational bone of the vertebral column.