[ sak-ruhm, sey-kruhm ]
/ ˈsæk rəm, ˈseɪ krəm /

noun, plural sac·ra [sak-ruh, sey-kruh]. /ˈsæk rə, ˈseɪ krə/. Anatomy.

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.



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Origin of sacrum

1745–55; <Late Latin (os) sacrum holy (bone), translation of Greek hieròn ostéon Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for sacrum

British Dictionary definitions for sacrum

/ (ˈseɪkrəm, ˈsækrəm) /

noun plural -cra (-krə)

(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 for sacrum

C18: from Latin os sacrum holy bone, because it was used in sacrifices, from sacer holy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for sacrum

[ sākrəm, săkrəm ]

n. pl. sa•cra (krə, săk)

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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for sacrum

[ sākrəm, săkrəm ]

Plural sacra

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.