Sacrum

or Os Sacrum, (sai'krūm.) [L., the sacred bone.] (Anat.) A portion of the vertebral column, consisting in man of five bones, which in the adult become soldered together. The S. is strongly united on each side to the hip-bone, the ilium; and below it is the coccyx. Sacs and Foxes, (saw ks; föks'ès.) (Ethnol.) Two allied tribes of N. Amer. Indians, formerly inhabiting the S. part of Iowa, and now located on a reservation in the Indian Territory. [s. 787]