Which prefix means Slow?

• A. Micro-
• B. Peri-
• C. Brady-
• D. Macro-

Answer: (C)

Brady- is the prefix meaning slow. It comes from the Greek bradys and is used in medical terms to indicate a slower-than-normal rate or rhythm. For example, bradycardia refers to a slow heart rate, and bradypnea to slow breathing. In contrast, micro- means small, peri- means around, and macro- means large, so they describe size or location rather than speed. A contrasting speed term you might see is tachy-, meaning fast, though it isn’t part of these options. So the prefix that means slow is brady-.