Sacrum

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Sacrum \Sa"crum\, n.; pl. {sacra}. [NL., fr. L. sacer sacred, os
     sacrum the lowest bone of the spine.] (Anat.)
     That part of the vertebral column which is directly connected
     with, or forms a part of, the pelvis.
     [1913 Webster]
  


     Note: It may consist of a single vertebra or of several more
           or less consolidated. In man it forms the dorsal, or
           posterior, wall of the pelvis, and consists of five
           united vertebrae, which diminish in size very rapidly
           to the posterior extremity, which bears the coccyx.
           [1913 Webster]

From WordNet (r) 2.0 [wn]:

  sacrum
       n : wedge-shaped bone consisting of five fused vertebrae forming
           the posterior part of the pelvis; its base connects with
           the lowest lumbar vertebra and its tip with the coccyx
       [also: {sacra} (pl)]