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sacrum

Line breaks: sa¦crum
Pronunciation: /ˈseɪkrəm
 
, ˈsak-/

Definition of sacrum in English:

noun (plural sacra /-krə/ or sacrums)

Anatomy
A triangular bone in the lower back formed from fused vertebrae and situated between the two hip bones of the pelvis.
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.

Origin

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

Definition of sacrum in:

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Pronunciation: vɪˈdʒɛsɪm(ə)l
adjective
relating to or based on the number twenty