Is MITIS a Wordle Word?

Yes. MITIS 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 MITIS mean?

A process for producing malleable iron castings by melting wrought iron, to which from 0.05 to 0.1 per cent of aluminum is added to lower the melting point, usually in a petroleum furnace, keeping the molten metal at the bubbling point until it becomes quiet, and then pouring the molten metal into a mold lined with a special mixture consisting essentially of molasses and ground burnt fire clay.
The malleable iron produced by this technique.

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

Starter word rating: WeakIn the top 82% of all valid Wordle words for testing common letters.
Vowels: I
Unique letters: 4 of 5Repeats I
Common letters: I, T

Hard-mode trap: 7 valid words fit the pattern MI_IS. If you reach it, you may need several guesses to find the last letter.

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.