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.
Leukoplakia in the mouth (oral leukoplakia), is defined as a predominantly white lesion of the oral mucosa that cannot be characterized as any other definable lesion. However, this definition is inconsistently applied, and some refer to any oral white patch as leukoplakia.