Hypertext Webster Gateway: "sacrum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sacrum \Sa"crum\, n.; pl. {sacra}. [NL., fr. L. sacer sacred, os
sacrum the lowest bone of the spine.] (Anat.)
That part of the vertebral column which is directly connected
with, or forms a part of, the pelvis.
Note: It may consist of a single vertebra or of several more
or less consolidated. In man it forms the dorsal, or
posterior, wall of the pelvis, and consists of five
united vertebr[ae], which diminish in size very rapidly
to the posterior extremity, which bears the coccyx.
From WordNet (r) 1.7 (wn)
sacrum
n : wedge-shaped bone consisting of five fused vertebrae forming
the posterior part of the pelvis; its base connects with
the lowest lumbar vertebra and its tip with the coccyx
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