What is indicated by the suffix -metry?

The suffix -metry signifies the process of measuring. It is commonly used in medical terminology to indicate a methodical approach to obtaining measurements related to various body functions, structures, or characteristics. This can be seen in terms such as "audiometry," which refers to the measurement of hearing ability, or "plethysmometry," used for measuring changes in volume within an organ or whole body.

In contrast, the other options describe different actions or processes. Visual examination is typically represented by the suffix -scopy, which denotes the use of a scope for examination. Crushing is indicated by the suffix -tripsy, often used in terms like "lithotripsy," referring to the crushing of stones in the kidney or gallbladder. Incision is denoted by the suffix -tomy, found in terms like "appendectomy," which involves cutting to remove the appendix. Thus, the selection that defines the act of measuring is indeed -metry.