Which prefix means "within, inside"?

The prefix that means "within" or "inside" is "intra-." It is used in various medical and scientific terms to indicate something that occurs or exists within a particular structure or boundary. For instance, "intravenous" refers to something that is inside or within a vein, while "intracellular" pertains to processes or structures occurring within a cell. The usage of "intra-" is commonplace in various disciplines, denoting interaction or action confined to a specific area or body.

The other prefixes present different meanings: "hyper-" refers to excess or above normal, "meso-" generally indicates a middle position, and "leuko-" is associated with white, often in the context of blood cells. Each of these prefixes is used in a variety of contexts but does not denote the concept of being within or inside.