Which prefix would indicate something being reduced or slower?

The prefix "brady-" is derived from the Greek word "bradus," which means slow. This prefix is commonly used in medical terminology to indicate a reduction in speed or a slower than normal rate. For example, the term "bradycardia" describes a condition where the heart beats at a slower rate than usual.

In contrast, the other prefixes refer to different concepts: "auto-" relates to self or automatic processes, "an-" denotes absence or lack of something, and "bi-" indicates two or double. Understanding these prefixes helps in deciphering medical terms and determining their meanings accurately.