Pelvis

(pělvis.) [L.] (Anat.) The cavity formed by the hip-bones. Each side of the pelvic arch is composed of three bones, which are soldered together in the adult, and form the os in nomina tum of the anatomist. The largest of these is the ilium, which is united to that portion of the vertebral column called the sacrum; the middle bone is the ischium, and the lowest the pubis, which joins its fellow on the opposite side, and forms as it were the crown of the arch. [s. 693]