noun, plural sacra
[sak-ruh, sey-kruh] /ˈsæk rə, ˈseɪ krə/ (Show IPA). Anatomy.
a bone resulting from the fusion of two or more vertebrae between the lumbar and the coccygeal regions, in humans being composed usually of five fused vertebrae and forming the posterior wall of the pelvis.
noun (pl) -cra (-krə)
(in man) the large wedge-shaped bone, consisting of five fused vertebrae, in the lower part of the back
the corresponding part in some other vertebrates

sacrum sa·crum (sā’krəm, sāk’rəm)
n. pl. sa·cra (sā’krə, sāk’rə)
The triangular segment of the spinal column that forms part of the pelvis and closes in the pelvic girdle posteriorly, is formed between the ages of 16 and 25 by the fusion of five originally separate sacral vertebrae, and articulates with the last lumbar vertebra, the coccyx, and the hipbone on either side.
(sā’krəm, sāk’rəm)

Plural sacra
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. See more at skeleton.


Read Also:

  • Sacrad

    sacrad sa·crad (sā’krād’) adv. Toward the sacrum.

  • Sacral

    adjective 1. of or relating to sacred rites or observances. adjective 1. of or relating to the sacrum. adjective 1. of, relating to, or associated with sacred rites adjective 1. of or relating to the sacrum sacral sa·cral (sā’krəl) adj. In the region of or relating to the sacrum.

  • Sacral artery

    sacral artery n. An artery that is one of two arteries that arise from the internal iliac artery and supplies the muscles and skin in that area and sends branches into the sacral canal; lateral sacral artery. An artery with origin in the back of the abdominal aorta, with distribution to the lower lumbar vertebrae, […]

  • Sacral canal

    sacral canal n. The continuation of the vertebral canal in the sacrum.

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