Is SLART a Wordle Word?

Yes. SLART is a valid Wordle word.

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

What does SLART mean?

Leftover(s), especially of food.“[…] they must be able to measure any earth—any inch-space of the heart whatever—else they are mere orts and slarts.”

To splash or splatter, especially with something dirty.“Luke at that dolly! — slarting t' barns wi' t' dish-clart, astead o' gehring wesh'd up,[…]”

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

Starter word rating: GoodIn the top 3% of all valid Wordle words for testing common letters.
Vowels: A
Unique letters: 5 of 5
Common letters: L, A, R, T

Hard-mode trap: 8 valid words fit the pattern S_ART. 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.