Is ILIUM a Wordle Word?

Yes. ILIUM is a valid Wordle word.

It is not on the Wordle answer list, so it is unlikely to be a daily answer.

What does ILIUM mean?

/ˈɪlɪəm/

The upper and widest of the three bones that make up each side of the hipbone and pelvis.
The ileum, part of the small intestine.

Definition from Wiktionary, available under the CC BY-SA license.

Starter word rating: WeakIn the top 89% of all valid Wordle words for testing common letters.
Vowels: I, U
Unique letters: 4 of 5Repeats I
Common letters: I, L

Letter ratings use how often each letter appears in Wordle answers.

Tap its tiles to the colours Wordle showed, and the Wordle Solver lists every word that still fits, with the best next guess.