Which suffix denotes "nourishment"?

The suffix that denotes "nourishment" is indeed -trophy. This suffix comes from the Greek word "trophē," meaning "nourishment" or "food." It is commonly used in medical terminology to indicate growth, development, or the maintenance of tissues and organs, often in relation to the nourishment they receive.

For instance, "hypertrophy" refers to the increase in the size of an organ or tissue due to the enlargement of its cells, often as a result of enhanced nutritional support or stimulation. Conversely, atrophy indicates a decrease in size or wasting away of an organ or tissue due to inadequate nutrition or stimulation.

The other suffixes do not relate to nourishment in this way. For example, -pexy typically refers to surgical fixation, -in denotes a substance or chemical, and -plasia relates to formation or development, often of tissues or cells, rather than the concept of nourishment itself.