cytostome

The term "cytostome" refers to a cell's mouth or feeding groove. It is a ventral opening found in some organisms, particularly certain types of protozoa, where they ingest food particles. This feeding groove is often associated with flagella that help direct food into the cell. The adjective form is "cytostomal," meaning relating to a cytostome.12

The concept of a cytostome is distinct from "cyclostome," which refers to a group of jawless fish like hagfishes and lampreys that have a sucking mouth. It is also different from "cytome," which refers to the formed inclusions within a cell's cytoplasm. The process of engulfing particles by cells, known as phagocytosis, is a related biological function, often performed by specialized cells like amoebas or white blood cells.3456