noun (plural coccyges /-ɪdʒiːz/ or coccyxes)
A small triangular bone at the base of the spinal column in humans and some apes, formed of fused vestigial vertebrae.
More example sentences
- The sacrum itself represents 5 fused bones, and the coccyx another vestigial 2-3 or more - the remains of the ancestral tail.
- The spinal column is composed of seven cervical vertebrae, twelve thoracic vertebrae, five lumbar vertebrae, the bony sacrum, and the coccyx.
- Many of my patients have pressure ulcers on the coccyx or sacrum.
late 16th century: via Latin from Greek kokkux 'cuckoo' (because the shape of the human bone resembles the cuckoo's bill).
- More example sentences
- The usual grouping formula of 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 4 coccygeal vertebrae is found in only about 20% of individuals studied.
- The lumbosacral plexus is formed by the union of the anterior primary divisions of the lumbar, sacral, and coccygeal nerves.
- The fifth sacral and the coccygeal nerves (when present) are located within the dural cavity.
Definition of coccyx in:
- The US English dictionary