What term relates to feces and signifies intestinal ways?

The term that relates to feces and signifies intestinal ways is "fecal." This term is derived from "feces," which refers to the solid waste matter that is expelled from the digestive tract. In the context of biological sciences and medicine, "fecal" is used to describe substances, conditions, or tests associated with the excretion process, such as fecal matter analysis or the fecal microbiome. This term is particularly relevant in areas such as gastrointestinal health, where understanding the characteristics and composition of feces can provide valuable insights into a person's digestive health and the functioning of the intestines.

In contrast, the other terms do not pertain specifically to feces or the intestinal system. "Ferrous" relates to iron and oxidation states, "flora" usually refers to the various microorganisms that inhabit different environments (including the gastrointestinal tract but is not synonymous with feces itself), and "filtration" refers to the process of separating solids from liquids, which is not directly connected to fecal material. Hence, "fecal" is the most accurate choice when discussing terms that directly relate to feces and the workings of the intestines.