The sacrum is the large, triangle shaped bone at the base of the spine. Many, though not all, animals with a backbone also have a sacrum.
wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx
That part of the vertebral column which is directly connected with, or forms a part of, the pelvis.
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