The prefix "tachy" indicates what condition regarding speed?

The prefix "tachy" originates from the Greek word "tachys," which means swift or fast. In medical terminology, it is commonly used to describe a rapid condition, particularly related to heart rate or other physiological processes. For example, "tachycardia" refers to a fast heart rate, whereas "tachypnea" indicates rapid breathing. Thus, when "tachy" is used, it unequivocally signifies something that is occurring at a fast pace, making the option indicating speed as "Fast" the correct interpretation of this prefix.