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sacrum definition

sa·crum (sā′krəm, sak′rəm)

noun pl. sacra -·cra (-krə, -rə) or sacrums -·crums

a thick, triangular bone situated near the lower end of the spinal column, where it joins both innominate bones to form the dorsal part of the pelvis: it is formed in humans of five fused vertebrae

Etymology: ModL < LL (os) sacrum, lit., sacred (bone), transl. of Gr hieron osteon < hieron, sacred, ? last (< hieros: see hiero-) + osteon: see ossify

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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