The Collaborative International Dictionary of English v.0.48:
Sacral \Sa"cral\, a. (Anat.) Of or pertaining to the sacrum; in the region of the sacrum. [1913 Webster]WordNet (r) 3.0 (2006):
sacral adj 1: of or relating to or near the sacrum 2: of or relating to sacred rites; "sacral laws"