What is the prefix for visible?

There isn't a single, universally accepted prefix for "visible". However, depending on the context, you could use:

* Vis-: This is the most common and straightforward prefix, used in words like "visible," "visibility," and "visualize."

* Visib-: This is another common variation, often used in more technical or scientific contexts.

Other prefixes could be used depending on the specific meaning you want to convey, but these are the most common ones for "visible."