#sacrum  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
  supertype:  bone__os  rigid connective tissue that makes up the skeleton of vertebrates
  part of:  pelvis
  part:  sacral_vertebra  one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum

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