sacrum
/ˈsækɹəm/ noun
Forms sacra sacrums
- noun (anatomy) A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.
Synonyms
Etymology
From Latin os sacrum (“holy bone”), a calque of Ancient Greek ἱερὸν ὀστέον (hieròn ostéon). Apparently so called either because the sacrum was the part of the animal offered in sacrifice or because of a putative belief that it is where a person's soul resides. A third explanation is that the term is a translation of Ancient Greek ἱερόν (hierón), which has two meanings: “holy, sacred”, and “big” — big being a more appropriate description of the sacrum — but compare.
Webster’s 1913
- noun That part of the vertebral column which is directly connected with, or forms a part of, the pelvis.
Etymology [NL., fr. L. sacer sacred, os sacrum the lowest bone of the spine.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “sacrum”, CC BY-SA 4.0. Details