The prefix "Ad-" means which of the following?

The prefix "Ad-" means "toward." In medical terminology, prefixes often modify the meaning of the root word to provide clarity about direction or proximity. When "Ad-" is used, it indicates movement or direction toward something. For example, in the word "adhesion," it refers to tissues sticking or growing toward each other. Understanding this prefix is essential as it helps in grasping various medical terms that denote processes, actions, or conditions relating to directionality within the body.