coccyx(redirected from tailbone)
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coccyx(kŏk`sĭks): see spinal columnspinal column,
bony column forming the main structural support of the skeleton of humans and other vertebrates, also known as the vertebral column or backbone. It consists of segments known as vertebrae linked by intervertebral disks and held together by ligaments.
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The fused vestige of caudal vertebrae forming the last bone of the vertebral column in humans and certain other primates.
a small triangular bone at the end of the spinal column in man and some apes, representing a vestigial tail