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.
Severe leukopenia develops in the presence of fatty degeneration of the bone marrow, an aplasia that arises as an independent disease (aplastic anemia), or as a result of severe intoxication (benzene, some drugs) or ionizing radiation.