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.
Viral infection: Leukopenia, low white cell count, is most often caused by viral infection. A number of different conditions or infections have to be considered as well.