coccyx

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coccyx

 [kok´siks]
the small bone caudad to the sacrum in humans, formed by the union of four (sometimes five or three) rudimentary vertebrae, and forming the caudal end of the vertebral column.

coc·cyx

, gen.

coc·cy·gis

, pl.

coc·cy·ges

(kok'siks, -si-jis, -si-jēs), [TA] Avoid the mispronunciations kok'iks and kos'iks.
The small bone at the end of the vertebral column in humans, formed by the fusion of four rudimentary vertebrae; it articulates above with the sacrum.
[G. kokkyx, a cuckoo, the coccyx]

coccyx

(kŏk′sĭks)
n. pl. coccyges (kŏk-sī′jēz, kŏk′sĭ-jēz′)
A small triangular bone at the base of the spinal column in humans and other apes, consisting of several fused rudimentary vertebrae. Also called tailbone.

coc·cyx

, pl. coccyges (kok'siks, -si-jēz) [TA]
The small bone at the end of the vertebral column in humans, formed by the fusion of four rudimentary vertebrae; it articulates above with the sacrum.
[G. kokkyx, a cuckoo, the coccyx]

coccyx

The rudimentary tail bone, consisting of four small vertebrae fused together and joined to the curved SACRUM. From the resemblance of the bone to a cuckoo's beak.

coccyx

the fusion of the posterior vertebrae to form a single unit, the coccyx. In humans three to five vertebrae are involved and these form the remnant of a tail.

Coccyx

The last bone of the spinal column, consisting of three to five fused vertebrae that connect with the sacrum, a part of the pelvis.
Mentioned in: Coccyx Injuries
References in periodicals archive ?
On the subject of new stools, when sitting on a flat stool, it still takes effort to accomplish the "tail-bone up" position (anterior pelvic rotation) even when the stool is adjusted so the knees are lower than the hips.