Ilium

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** The broad, dorsal, upper, and widest of the three principal bones composing either half of the pelvis.

**Synonyms:** - BONE, ILIUM - Bone structure of ilium (body structure) - ILIUM - Iliac - iliac bone - ilium - ilium bone - os iliacum - os ilii - os ilium