noun (plural sacra /ˈsakrə, ˈsā-/ or sacrums)Anatomy
A triangular bone in the lower back formed from fused vertebrae and situated between the two hipbones of the pelvis.
More example sentences
- The spinal column is composed of seven cervical vertebrae, twelve thoracic vertebrae, five lumbar vertebrae, the bony sacrum, and the coccyx.
- The lowest lumbar vertebra articulates with the sacrum, and this in turn with the coccyx.
- Vesalius said that the human sacrum normally has five vertebrae but one of six is by no means rare.
Definition of sacrum in:
- The British & World English dictionary