Which term describes the process of measuring?

The term that describes the process of measuring is indeed "metry." This suffix is derived from the Greek word "metron," meaning "measure." In medical terminology, neologisms often utilize this suffix to indicate various methods of measurement relating to health, such as in the terms "spirometry," which is the measurement of breath, or "encephalometry," referring to measuring the dimensions of the brain.

The other options represent different concepts: "scope" refers to viewing or examining, "therapy" relates to treatment of a condition, and "trophy" pertains to nourishment or growth. While these terms are significant in medical contexts, they do not convey the specific action of measurement that "metry" accurately describes.