In medical terminology, what does the prefix "anti" or "ant" mean?

The prefix "anti" or "ant" originates from Greek and Latin roots, meaning "against" or "opposite." It is commonly used in medical terminology to describe substances or actions that counteract effects, such as in the terms "antibiotic" (against bacteria) or "antihistamine" (against histamines). This fundamental concept of opposing or resisting is essential in various medical contexts, particularly in pharmacology where medications are designed to counteract specific diseases or reactions. Understanding this prefix helps in deciphering many terms related to treatment and intervention in healthcare.