Definitions for sacrumˈsæk rəm, ˈseɪ krəm; ˈsæk rə, ˈseɪ krə
Random House Webster's College Dictionary
sac•rumˈsæk rəm, ˈseɪ krəm; ˈsæk rə, ˈseɪ krə(n.)(pl.)sac•ra
a bone between the lumbar vertebrae and tail vertebrae, composed of five fused vertebrae that form the posterior pelvic wall.
Origin of sacrum:
1745–55; < LL (os) sacrum holy (bone)
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
A large triangular bone located at the base of the spine between the two hipbones of pelvis and formed from fused vertebrae.
Origin: From os sacer, translation of ἱερός ὀστέον. Called so either because supposedly sacrum was the part of an animal offered in sacrifice or because of the belief that the soul of the man resides there.
that part of the vertebral column which is directly connected with, or forms a part of, the pelvis