sacrum

Noun
  1. 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 (synset 105286906)
    is a type of: bone, os - rigid connective tissue that makes up the skeleton of vertebrates
    has: sacral vertebra - one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum
    is a part of: hip, pelvic arch, pelvic girdle, pelvis - the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates

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