Which prefix denotes the concept of "both"?

The prefix that denotes the concept of "both" is "ambi-." This prefix comes from the Latin word "amb-" meaning "on both sides" or "both." In medical terminology, it is often used to describe conditions or processes that involve two sides or two entities. For instance, "ambidextrous" refers to a person who is able to use both hands with equal skill.

In contrast, the other prefixes do not convey the meaning of "both." "Di-" typically indicates "two" or "double," such as in "diplopia," which means double vision but does not emphasize the idea of both sides in the same way. "Uni-" means "one" and denotes singularity, while "quadri-" refers to "four," indicating a different quantity altogether. Thus, "ambi-" most accurately represents the idea of "both" in medical terminology.