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| sa·crum [ sáykrəm, sákrəm ] (plural sa·crums or sa·cra [ sáykrə, sákrə ]) |
noun |
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| Definition: |
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triangular bone in lower back: a triangular bone at the base of the spine that joins to a hip bone on each side and forms part of the pelvis. In human beings it consists of five fused vertebrae.
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| [Mid-18th century. < Latin (os) sacrum, translation of Greek hieron (osteon) "sacred (bone)"; from the belief that the soul resided there] |
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