Is RONDO a Wordle Word?

Yes. RONDO is a valid Wordle word.

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

What does RONDO mean?

/ˈɹɒn.dəʊ/

A musical composition, commonly of a lively, cheerful character, in which the first strain recurs after each of the other strains.
A small, disk-shaped piece of food, especially a single-serving dessert or small piece of candy.
A dark-skinned grape, a hybrid of Vitis vinifera with Vitis amurensis and others.

2 more noun definitions

A game resembling keep-away, used to train soccer players: one group is tasked with completing a number of passes while the other group tries to take possession of the ball.
A gambling game played with small balls on a table.

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

Starter word rating: WeakIn the top 72% of all valid Wordle words for testing common letters.
Vowels: O
Unique letters: 4 of 5Repeats O
Common letters: R, O

Hard-mode trap: 6 valid words fit the pattern _ONDO. 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.