In medical terminology, feces is considered:

Feces, or stool, is classified as output in medical terminology because it represents the waste material that is expelled from the body after the digestion process. When food is consumed, it is processed by the digestive system, leading to the absorption of nutrients and water in the intestines. What remains after this process is eliminated as feces. This expulsion is a key function of the body’s waste management system, indicating that the body is functioning properly in terms of eliminating excess and undigested substances.

In contrast, intake refers to what is consumed, absorption focuses on the assimilation of nutrients into the bloodstream, and filtration generally pertains to the processes in the kidneys or other systems that remove certain substances from fluids. Thus, feces is best described as output, highlighting its role as the end product of digestion and metabolism.