The adjectival form of ilium is which?

The adjectival form of ilium is which?

• A. Illac
• B. Ischial
• C. Iliac
• D. Ilium

Answer: (C)

When naming adjectives for bones, we use the Latin name of the structure and add an appropriate ending. For the ilium, the correct adjective is iliac, as in iliac crest or iliac fossa. This form comes from ilium with a phonetic adjustment to fit medical terminology. The other options don’t fit because illac isn’t the standard form, and ischial refers to the ischium, not the ilium. The noun ilium itself isn’t the adjective, and ileal would describe the ileum, a part of the small intestine, not the ilium.

When naming adjectives for bones, we use the Latin name of the structure and add an appropriate ending. For the ilium, the correct adjective is iliac, as in iliac crest or iliac fossa. This form comes from ilium with a phonetic adjustment to fit medical terminology. The other options don’t fit because illac isn’t the standard form, and ischial refers to the ischium, not the ilium. The noun ilium itself isn’t the adjective, and ileal would describe the ileum, a part of the small intestine, not the ilium.