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: Mild thinning of the bone mass. Osteopenia represents a low bone mass and is not as severe as osteoporosis. Osteopenia results when formation of new bone (osteoid synthesis) is not sufficient to offset normal bone loss (osteoid lysis).steopenia: Mild thinning of the bone mass. Osteopenia represents a low bone mass and is not as severe as osteoporosis. Osteopenia results when formation of new bone (osteoid synthesis) is not sufficient to offset normal bone loss (osteoid lysis).