Which term is used for an animal with one stomach that has four compartments?

The term for an animal with one stomach that has four compartments is "ruminant." Ruminants, such as cows, sheep, and goats, possess a specialized stomach structure that includes four distinct chambers: the rumen, reticulum, omasum, and abomasum. This unique anatomy allows them to effectively digest fibrous plant materials by fermenting and breaking down cellulose through a process called rumination.

In contrast, monogastric animals have a single-chambered stomach, making them less equipped to process tough plant materials compared to ruminants. While herbivores are generally plant-eating animals and can include both ruminants and monogastrics, the specific characteristic of having a four-compartment stomach clearly identifies a ruminant. Carnivores, on the other hand, primarily consume meat and typically have a simpler digestive system. Thus, the definition and biological adaptations of ruminants align with the question prompt regarding the structure of their stomachs.