Definition of sacrum in English:


Syllabification: sac·rum
Pronunciation: /ˈsakrəm, ˈsā-

noun (plural sacra /ˈsakrə, ˈsā-/ or sacrums)

  • A triangular bone in the lower back formed from fused vertebrae and situated between the two hipbones of the pelvis.
    More example sentences
    • The spinal column is composed of seven cervical vertebrae, twelve thoracic vertebrae, five lumbar vertebrae, the bony sacrum, and the coccyx.
    • The lowest lumbar vertebra articulates with the sacrum, and this in turn with the coccyx.
    • Vesalius said that the human sacrum normally has five vertebrae but one of six is by no means rare.


mid 18th century: from Latin os sacrum, translation of Greek hieron osteon 'sacred bone' (from the belief that the soul resides in it).

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