About
The character "骶" refers to the sacrum and is structured as a phono-semantic compound, combining the radical "骨" for bone with the phonetic component "氐" which indicates its pronunciation and concurrently carries the meaning of a base or foundation, aligning with the sacrum's position at the lower spine. Etymologically, this construction reflects the bone's anatomical role, and the character has been employed in Chinese medical and anatomical texts specifically for this designation, with no recorded shifts in its core meaning over time.