Which prefix indicates "both"?

The prefix "ambi-" is derived from Latin, meaning "both" or "on both sides." This prefix is used in various medical and scientific terms to denote dual aspects or features. For instance, "ambidextrous" describes a person who can use both hands with equal skill. In medical contexts, this prefix may be used to describe conditions or treatments that involve both sides of the body or dual characteristics.

Other prefixes such as "meta-," "pseudo-," and "iso-" have distinct meanings. "Meta-" typically refers to change or transformation, while "pseudo-" indicates something that is false or not genuine. "Iso-" relates to equality or uniformity in certain contexts, such as in "isotonic," which describes solutions with equal osmotic pressure.

Thus, the correct choice is the one that specifically conveys the notion of "both," which is accurately represented by "ambi-."