Which prefix means 'fast' in medical terminology?

The prefix that means 'fast' in medical terminology is "tachy-." This prefix is commonly used to denote an increased or rapid pace, especially regarding heart rate. For example, "tachycardia" refers to a condition where the heart beats faster than normal, typically defined as a resting heart rate over 100 beats per minute in adults.

Understanding the meaning of prefixes like "tachy-" is essential for medical professionals, as they frequently encounter terms that describe various conditions affecting speed, such as respiration or heart activity. This knowledge aids in accurate communication and comprehension of medical documentation and patient care.