Which prefix means slow?

• A. Tachy-
• B. Endo-
• C. Brady-
• D. Hypo-

Answer: (C)

Brady- is the prefix that means slow. It comes from the Greek bradys meaning slow and is used to describe slower-than-normal bodily processes. For example, bradycardia means a slow heart rate, and bradypnea means slow breathing. This is the best answer because it directly conveys slowness, while the other prefixes indicate different ideas: tachy- means fast, endo- means within, and hypo- means under or below (often reduced levels). Recognizing brady- helps you read terms that describe slowed physiological functions.