[ sak-ruhm, sey-kruhm ]
See synonyms for sacrum on
noun,plural sac·ra [sak-ruh, sey-kruh]. /ˈsæk rə, ˈseɪ krə/. Anatomy.
  1. 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

1745–55; <Late Latin (os) sacrum holy (bone), translation of Greek hieròn ostéon Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use sacrum in a sentence

  • Qu cum Rmam vnisset, ut6 populum ferum religine mtigret, sacra plrima nstituit.

    Selections from Viri Romae | Charles Franois L'Homond

British Dictionary definitions for sacrum


/ (ˈseɪkrəm, ˈsækrəm) /

nounplural -cra (-krə)
  1. (in man) the large wedge-shaped bone, consisting of five fused vertebrae, in the lower part of the back

  2. the corresponding part in some other vertebrates

Origin of 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

Scientific definitions for sacrum


[ krəm, săkrəm ]

Plural sacra
  1. 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.