coccyx

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coc·cyx / ˈkäksiks/ • n. (pl. coc·cy·ges / ˈkäksəˌjēz/ or coc·cyx·es / ˈkäksiksiz/ ) a small, triangular bone at the base of the spinal column in humans and some apes, formed of fused vestigial vertebrae. DERIVATIVES: coc·cyg·e·al / käkˈsijēəl/ adj.

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coccyx (kok-siks) n. (pl. coccyges or coccyxes) the lowermost element of the backbone: the vestigial human tail. It consists of four rudimentary coccygeal vertebrae fused to form a triangular bone that articulates with the sacrum. See also vertebra.
coccygeal (kok-sij-iăl) adj.

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coccyx The last bone in the vertebral column in apes and humans (i.e. tailless primates). It is formed by the fusion of 3–5 caudal vertebrae.

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coccyx (anat.) terminal bone of the spinal column. XVII. — L. — Gr. kókkux CUCKOO (the bone being supposed to resemble a cuckoo's bill).

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coccyx (kŏk´sĬks): see spinal column.

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