fatty liver

This term is primarily used in clinical and medical contexts to describe a pathological state of the liver. It is often used as a shorthand for steatosis, though in a patient-facing context, it is the standard descriptive term for the condition.

Because it describes a specific medical diagnosis or physiological state, it is treated as an uncountable noun. One does not refer to "a fatty liver" as a countable object in the sense of having multiple distinct instances of the disease within one organ, but rather as a condition the patient has.