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 usually caused by a redistribution of blood that occurs with certain physiological conditions, such as with increased tonus in the vagus nerve, with diminished function in the adrenal cortex and in the sympathetic nervous system, after a hot bath, and with starvation. Cases are known of familial, âconstitutionalâ leukopenia.