sacral vertebra
Anatomical term for the vertebrae that form the sacrum.
The sacral vertebrae normally fuse to form the sacrum in adults.
Standard kanji spelling; 仙 refers to the sacrum.
Alternate kanji spelling using 薦; less common than 仙椎.
From 仙 (sacrum) + 椎 (vertebra). The kanji 仙 is used here for its anatomical meaning related to the sacrum.