
1) Backbone part 2) Bone 3) Bone in your butt 4) Bone of the thorax 5) Bone of the vertebral column 6) Hipbone attachment 7) Part of the backbone 8) Pelvic bone 9) Pelvis part 10) Triangular bone
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• (n.) That part of the vertebral column which is directly connected with, or forms a part of, the pelvis.
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http://thinkexist.com/dictionary/meaning/sacrum/

The region of the vertebral column that consists of three fused vertebrae that articulate the pelvic girdle.
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http://www.akc.org/about/glossary.cfm

The large, triangle-shaped bone in the lower spine that forms part of the pelvis. It is made of 5 fused bones of the spine.
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http://www.cancer.gov/dictionary?expand=S

Curved triangular bone at the base of the spine, consisting of five fused vertebrae known as sacral vertebrae
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http://www.childrenshospital.org/centers-and-services/centers/orthopedic-ce

Sacrum and coccyx. The sacrum is the portion above the red line. Sacrum, pelvic surface. Diagrams from Gray's Anatomy A large irregular triangule shaped bone in the lower part of the spinal column. It is made of five fused vertebrae (sacral vertebrae). The sacrum's broad upper part a...
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http://www.daviddarling.info/encyclopedia/S/sacrum.html

The sacrum is the part of the backbone that is attached to the pelvis.
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

Large triangular bone in the lower spine.
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http://www.encyclo.co.uk/local/20560

Group of five fused vertebrae located just below the lumbar vertebrae of the lower back.
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http://www.encyclo.co.uk/local/20906

<anatomy> The triangular-shaped bone lying between the 5th lumbar vertebra and the coccyx (tailbone). ... It consists of 5 vertebrae fused together and it articulates on each side with the bones of the pelvis (ilium), forming the sacroiliac joints. ... (17 Dec 1997) ...
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http://www.encyclo.co.uk/local/20973

(sa´krәm) the triangular bone at the base of the spine formed by usually five fused vertebrae wedged dorsally between the two hip bones.
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http://www.encyclo.co.uk/local/21001

The triangular bone made up of five fused vertebrae that is situated below the lumbar vertebrae and between the hip bones.
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http://www.encyclo.co.uk/local/21447

One of the three bones that make up the pelvic ring.
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http://www.encyclo.co.uk/local/22246
Sa'crum noun ;
plural sacra [ New Latin , from Latin
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. » It may consist of a single vertebra ...
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http://www.encyclo.co.uk/webster/S/4

A curved triangular bone in the lower part of the back.
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http://www.gadsbywicks.co.uk/uploaded/3822.pdf

The sacrum is the portion of the vertebral column between the lumbar vertebrae and the structures of the coccyx. It is composed of five vertebrae which are fused together to form a single bone structure. The sacrum features a median crest which is made of the fused spinous processes of its component vertebrae. Beneath this crest is the sacral canal...
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http://www.probertencyclopaedia.com/browse/ES.HTM

The sacrum is at the bottom of the spine and lies between the fifth lumbar segment and the coccyx (tailbone). The sacrum is a triangular-shaped bone and consists of five segments (S1
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http://www.spine-health.com/glossary/s/sacrum

Bone formed by the fusion of the sacral vertebrae, at the lower end of the spinal column.
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http://www.thehorse.com/Glossary.xhtml?L=S

sacer, sacred.
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https://aclandanatomy.com/Glossary.aspx

the triangular bone located at the bottom of the spine that is connected to the tailbone, the hipbones near the sacroilial joints, and the rest of the spine
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https://www.encyclo.co.uk/local/20875
noun wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx
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https://www.encyclo.co.uk/local/20974

The region of the vertebral column that consists of three fused vertebrae that articulate the pelvic girdle.
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https://www.encyclo.co.uk/local/21273

Latin sacer = sacred (probably considered so because of its size).
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https://www.encyclo.co.uk/local/21450

Five fused vertebrae below the last lumbar vertebra.
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https://www.ioshospital.com/orthopaedics/learnMore/glossaryOfTerms.aspx

One of the three bones (sacrum and two pelvic bones) that make up the pelvic ring
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https://www.orthohealth.com/glossary/
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