Definitions for sacral vertebra
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Princeton's WordNet
sacral vertebra(noun)
one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum
Wiktionary
sacral vertebra(Noun)
Any of the five vertebra that are fused to form the sacrum.
Citation
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"sacral vertebra." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/sacral vertebra>.

