The suffix "-meter" indicates an instrument used to measure. Which option describes this meaning?

• A. Instrument used to observe
• B. Instrument used to record
• C. Instrument used to measure
• D. A disease

Answer: (C)

The suffix -meter signals an instrument designed to measure something. So the option that describes this meaning is “instrument used to measure,” because it directly states the function of such devices (for example, thermometer records temperature, spirometer measures lung function). The other ideas point to different functions: observing with -scope (like a microscope), recording with -graph or -gram (like a cardiograph), and a disease is not an instrument at all. Recognizing -meter as a measurement tool helps you decode many medical terms quickly.