(kɒkˈsɪdʒɪəl ˈvɜːtɪbriː)
noun
1. A small triangular bone at the end of the spinal column in man and some apes, representing a vestigial tail.
2. A segment of the bony spinal column in the lower portion of the back. Formed by a fusion of four vertebra. See Coccyx
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