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 a condition characterized by decreased bone density that results when bone is lost faster than it is created. It is not the same thing as osteoporosis, but people who have this condition are at risk of developing osteoporosis. As with osteoporosis, it can be diagnosed with a simple procedure known as a bone density test.