Is ICTUS a Wordle Word?

Yes. ICTUS 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 ICTUS mean?

The pulse.
A sudden attack, blow, stroke, or seizure, as in a sunstroke, the sting of an insect, pulsation of an artery, etc.
The stress of voice laid upon an accented syllable of a word. Compare arsis.

1 more noun definition

In conducting, the indication of a musical event, most often the beat of the tempo or the entry of a section of the orchestra.

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

Starter word rating: WeakIn the top 44% of all valid Wordle words for testing common letters.
Vowels: I, U
Unique letters: 5 of 5
Common letters: I, T

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.