Is ILEUS a Wordle Word?

Yes. ILEUS is a valid Wordle word.

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

Plurals ending in S are almost never chosen as Wordle answers.

What does ILEUS mean?

(modern usage) Disruption of the normal propulsive ability of the gastrointestinal tract, due to failure of peristalsis.
(broad definition, now rare) Disruption of the normal propulsive ability of the gastrointestinal tract from any cause.

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

Starter word rating: GoodIn the top 10% of all valid Wordle words for testing common letters.
Vowels: I, E, U
Unique letters: 5 of 5
Common letters: I, L, E

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.