- a bone resulting from the fusion of two or more vertebrae between the lumbar and the coccygeal regions, in humans being composed usually of five fused vertebrae and forming the posterior wall of the pelvis.
Origin of sacrum
Examples from the Web for sacrum
Distance from acetabular axis to anterior end of sacrum 30 mm.Extinct Birds
The straightness of the sacrum will also be a guide in other cases.A System of Midwifery
The ilia are not connected with the sacrum by ossified sacral ribs.The Vertebrate Skeleton
Sidney H. Reynolds
The sacrum is formed by a number of caudal and dorsal vertebr.Reptiles and Birds
The ossification of the sacrum also has reached its culminating point.Omphalos
Philip Henry Gosse
- (in man) the large wedge-shaped bone, consisting of five fused vertebrae, in the lower part of the back
- the corresponding part in some other vertebrates
Word Origin and History for sacrum
bone at the base of the spine, 1753, from Late Latin os sacrum "sacred bone," from Latin os "bone" (see osseous) + sacrum, neuter of sacer "sacred" (see sacred). Said to be so called because the bone was the part of animals that was offered in sacrifices. Translation of Greek hieron osteon. Greek hieros also can mean "strong," and some sources suggest the Latin is a mistranslation of Galen, who was calling it "the strong bone."
- The triangular segment of the spinal column that forms part of the pelvis and closes in the pelvic girdle posteriorly, is formed between the ages of 16 and 25 by the fusion of five originally separate sacral vertebrae, and articulates with the last lumbar vertebra, the coccyx, and the hipbone on either side.
- A triangular bone at the base of the spine, above the coccyx (tailbone), that forms the rear section of the pelvis. In humans it is made up of five vertebrae that fuse together by adulthood. See more at skeleton.