Definitions

1. noun

Either of the two widest and most superior of the three bones that make up the pelvis in many vertebrates.

“The ilium bone is a crucial part of the pelvis in humans.”

2. anatomy

The widest and most superior part of the hip bone.

“In anatomy, the ilium is the upper part of the pelvis.”

3. biology

A bone in the pelvis of some animals, such as birds and reptiles.

“In birds, the ilium bone is a vital part of the skeletal system.”