What is a prefix for correct?

There isn't a single, commonly used prefix for "correct". However, depending on the context, you could consider these options:

General:

* Right- (e.g., rightness, righteousness)

* True- (e.g., truth, truism)

* Accurate- (e.g., accuracy, accurate)

More specific:

* Ortho- (meaning "straight" or "correct", often used in scientific contexts)

* Recti- (meaning "straight" or "right", often used in legal contexts)

Ultimately, the best prefix to use will depend on the specific meaning you want to convey.