| sacrum | | |
| n. (body) | 1. 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. |
| ~ bone, os | rigid connective tissue that makes up the skeleton of vertebrates. |
| ~ sacral vertebra | one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum. |
| ~ pelvic arch, pelvic girdle, pelvis, hip | the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates. |
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