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.
Osteopenia is defined as a condition of decreased bone density caused by a greater bone resorption than bone creation (see the eMedTV article Bone) . Osteopenia is considered a milder form of bone loss that does not meet the criteria of osteoporosis.steopenia is defined as a condition of decreased bone density caused by a greater bone resorption than bone creation (see the eMedTV article Bone) . Osteopenia is considered a milder form of bone loss that does not meet the criteria of osteoporosis.