What is Triathletes suffix and prefix?

The word "triathlete" doesn't have a traditional prefix or suffix in the way that words like "unhappy" (un- prefix) or "quickly" (ly- suffix) do.

It's formed directly from the word "triathlon," which itself combines:

* "tri" (prefix meaning "three")

* "athlon" (suffix referring to an athletic competition)

So, "triathlete" is a combination of the meaning of "three" and "athlete," signifying someone who participates in a three-part athletic competition.