Ilium (noun)

The upper and widest bone of the hipbone, located at the back and flaring out to the sides.

Origin:

From the latin word ile meaning 'flank'.

Examples:

1. The ilium is a crucial part of the pelvic girdle, providing stability and support to the torso.
2. The doctor felt along the patient's ilium, searching for any signs of pain or discomfort.
3. The ilium of a horse is a distinctive feature, and can be used to identify the species.
4. The ilium is one of three bones that make up the hipbone, along with the ischium and pubis.
5. The patient had a severe fracture of the ilium, which required surgery to repair.