Which prefix is associated with the meaning "fast"?

The prefix "tachy-" is derived from the Greek word "tachys," which means "swift," "quick," or "fast." It is frequently used in medical terminology to describe conditions or concepts associated with speed. For example, the term "tachycardia" refers to an abnormally fast heart rate. Therefore, when exploring prefixes related to the meaning of "fast," "tachy-" is the only choice that directly conveys this concept with a clear etymological connection.

The other prefixes have different meanings and do not share this specific association with speed. "Trans-" generally means "across" or "beyond"; "ultra-" means "beyond" or "extreme"; and "super-" refers to being "above," "over," or "greater than." While each has its own distinct applications, none convey the notion of fast in the way that "tachy-" does.