The large, heavy bone at the base of the spine, which is made up of fused sacral vertebrae. The sacrum is located in the vertebral column, between the lumbar vertebrae and the coccyx. It is roughly triangular in shape, and makes up the back wall of the pelvis. The female sacrum is wider and less curved than the male. See also pelvis, vertebral column, sacral vertebrae.
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The segment of the vertebral column forming part of the pelvis; a broad, slightly curved, spade-shaped bone, thick above, thinner below, closing in the pelvic girdle posteriorly; it is formed by the fusion of five originally separate sacral vertebrae; it articulates with the last lumbar vertebra, the coccyx, and the hip bone on either side. SYN: os s. [TA], sacred bone, vertebra magna. [L. (lit. sacred bone), neuter of sacer (sacr-), sacred]
- assimilation s. one which is composed of six segments, the last lumbar vertebra assuming the appearance of a sacral segment; or one which is composed of but four segments, the first sacral being free and having the characteristics of a lumbar vertebra.

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sa·crum 'sak-rəm, 'sā-krəm n, pl sa·cra 'sak-rə, 'sā-krə the part of the spinal column that is directly connected with or forms a part of the pelvis by articulation with the ilia and that in humans forms the dorsal wall of the pelvis and consists of five fused vertebrae diminishing in size to the apex at the lower end which bears the coccyx

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n. (pl. sacra)
a curved triangular element of the backbone consisting of five fused vertebrae (sacral vertebrae). It articulates with the last lumbar vertebra above, the coccyx below, and the hip bones laterally. See also vertebra.
sacral adj.

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sa·crum (saґkrəm) [L. “sacred”] the triangular bone just below the lumbar vertebrae; see os sacrum [TA]. See illustration. sacral adj

Dorsal (A) and pelvic (B) surfaces of the sacrum and coccyx.

Medical dictionary. 2011.

Look at other dictionaries:

  • sacrum — [ sakrɔm ] n. m. • 1793; os sacrum av. 1478 « os sacré », parce qu il était offert aux dieux dans les sacrifices d animaux ♦ Anat. Os formé par la réunion des cinq vertèbres sacrées, à la partie inférieure de la colonne vertébrale, articulé avec… …   Encyclopédie Universelle

  • Sacrum — Sacrum. Vue antérieure. Sacrum. Vue postérieure. Le sacrum est un os …   Wikipédia en Français

  • sacrum — SÁCRUM s.n. Os triunghiular (format din cinci vertebre sudate) aşezat în partea de jos a coloanei vertebrale şi care, împreună cu oasele pelviene, formează bazinul. [var.: sácru s.n.] – Din fr., lat. sacrum. Trimis de ana zecheru, 07.05.2003.… …   Dicționar Român

  • sacrum — bone at the base of the spine, 1753, from L.L. os sacrum sacred bone, from L. os bone + sacrum, neuter of sacer sacred (see SACRED (Cf. sacred)). Said to be so called because the bone was the part of animals that was offered in sacrifices.… …   Etymology dictionary

  • Sacrum — Sa crum, n.; pl. {sacra}. [NL., fr. L. sacer sacred, os sacrum the lowest bone of the spine.] (Anat.) That part of the vertebral column which is directly connected with, or forms a part of, the pelvis. [1913 Webster] Note: It may consist of a… …   The Collaborative International Dictionary of English

  • Sacrum — (Os sacrum), das Kreuzbein (s. d. und Wirbelsäule) …   Meyers Großes Konversations-Lexikon

  • sacrum — sacrum; syn·sacrum; …   English syllables

  • sacrum — {{/stl 13}}{{stl 7}}[wym. sakrum] {{/stl 7}}{{stl 8}}rz. n ndm, blm {{/stl 8}}{{stl 7}} sfera rzeczy, zjawisk, spraw świętych przeciwstawiona sferze profanum (obejmującej rzeczy, zjawiska, sprawy świeckie) : {{/stl 7}}{{stl 10}}Zaliczać jakieś… …   Langenscheidt Polski wyjaśnień

  • sacrum — ► NOUN (pl. sacra or sacrums) Anatomy ▪ a triangular bone in the lower back formed from fused vertebrae and situated between the two hip bones of the pelvis. ORIGIN from Latin os sacrum sacred bone (from the belief that the soul resides in it) …   English terms dictionary

  • sacrum — [sā′krəm, sak′rəm] n. pl. sacra [sā′krə, sā′rə] or sacrums [ModL < LL (os) sacrum, lit., sacred (bone), transl. of Gr hieron osteon < hieron, sacred, ? last (< hieros: see HIERO ) + osteon: see OSSIFY] a thick, triangular bone situated… …   English World dictionary

  • Sacrum os — (Anat.), das Kreuzbein …   Pierer's Universal-Lexikon

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