What are examples of landforms? A: The four main types of landforms are mountains, plateaus, plains and hills. A landform is defined as any natural feature on the Earth's surface, which incl... Full Answer >
Definition of leukopenia. : a condition in which the number of white blood cells circulating in the blood is abnormally low.
Leukopenia is a decreased number of white blood cells. This can leave a person vulnerable to infections. Learn about the different types of leukopenia: neutropenia and lymphopenia and their causes.