Sacrum definitions

sā'krəm, săk'rəm
A triangular bone made up of five fused vertebrae and forming the posterior section of the pelvis.
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A thick, triangular bone situated near the lower end of the spinal column, where it joins both innominate bones to form the dorsal part of the pelvis: it is formed in humans of five fused vertebrae.
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A triangular bone made up of five fused vertebrae and forming the posterior section of the pelvis.
noun
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A triangular bone at the base of the spine, above the coccyx (tailbone), that forms the rear section of the pelvis. In humans it is made up of five vertebrae that fuse together by adulthood.
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(anatomy) A large triangular bone located at the base of the spine between the two hipbones of pelvis and formed from fused vertebrae.
noun
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Origin of sacrum

New Latin from Late Latin (os) sacrum sacred (bone), sacrum (translation of Greek hieron (osteon) sacred (bone)) (so called from the use of the sacrum and coccyx of sacrificed animals in divination) neuter of Latin sacer sacred, holy sacred