sacrum

sa·crum Audio Help (sā'krəm, sāk'rəm)

n. pl. sa·cra (sā'krə, sāk'rə)
A triangular bone made up of five fused vertebrae and forming the posterior section of the pelvis.

[New Latin, from Late Latin (os) sacrum (translation of Greek hieron (osteon), sacred (bone)), neuter of Latin sacer, sacred; see sacred.]

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