sacrum

1. n. That part of the vertebral column which is directly connected with, or forms a part of, the pelvis. Source: opted

2. n. 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 Source: wordnet

3. That part of the vertebral column which is directly connected with, or forms a part of, the pelvis. Note: It may consist of a single vertebra or of several more or less consolidated. In man it forms the dorsal, or posterior, wall of the pelvis, and consists of five united vertebræ, which diminish in size very rapidly to the posterior extremity, which bears the coccyx. Source: webster

4. That part of the vertebral column which is directly connectedwith, or forms a part of, the pelvis. Source: adambom

5. n:100 n. 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 Source: ecdict

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