| tail bone | | |
| n. (body) | 1. coccyx, tail bone | the end of the vertebral column in humans and tailless apes. |
| ~ bone, os | rigid connective tissue that makes up the skeleton of vertebrates. |
| ~ spinal column, spine, vertebral column, rachis, backbone, back | the series of vertebrae forming the axis of the skeleton and protecting the spinal cord.; "the fall broke his back" |
| ~ caudal vertebra, coccygeal vertebra | one of 4 vertebrae in the human coccyx. |
| ~ pelvic arch, pelvic girdle, pelvis, hip | 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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