Definition of coccyx in English:

coccyx

Syllabification: coc·cyx
Pronunciation: /ˈkäksiks
 
/

noun (plural coccyges /ˈkäksəˌjēz/ or coccyxes /ˈkäksiksiz/)

  • 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.

Derivatives

coccygeal

Pronunciation: /käkˈsijēəl/
adjective
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.

Origin

late 16th century: via Latin from Greek kokkux 'cuckoo' (because the shape of the human bone resembles the cuckoo's bill).

More definitions of coccyx

Definition of coccyx in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day kerf
Pronunciation: kərf
noun
a slit made by cutting with a saw