Sacrum

sā′krum, n. a triangular bone situated at the lower part of the vertebral column (of which it is a natural continuation), and wedged between the two innominate bones, so as to form the keystone to the pelvic arch.— adj. Sā′cral .— n. Sācral′gia , pain in the region of the sacrum.— adjs. Sācrocos′tal , connected with the sacrum and having the character of a rib (also n. ); Sācroil′iac , pertaining to the sacrum and ilium; Sācrolum′bar , pertaining to sacral and lumbar vertebræ; Sācropū′bic , pertaining to the sacrum and to the pubes; Sācrorec′tal , pertaining to the sacrum and the rectum; Sācrosciat′ic , pertaining to the sacrum and the hip; Sācrover′tebral , pertaining to the sacrum and that part of the vertebral column immediately anterior to it. [L. sacrum ( os , bone), sacred.]