Etymology
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sacral (adj.)

1767, in anatomy, "of or pertaining to the sacrum," the bone at the base of the spine (see sacrum), from Modern Latin sacralis. In anthropology, "pertaining to religious rites," 1882, from Latin sacrum "sacred thing, rite," neuter of sacer "sacred" (see sacred). Related: sacralization; sacrality.

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Definitions of sacral

sacral (adj.)
of or relating to or near the sacrum;
sacral (adj.)
of or relating to sacred rites;
sacral laws
From wordnet.princeton.edu