* Osteoporosis is a systemic skeletal disease characterized by compromised bone mineral density and microarchitectural deterioration of bone tissue, leaving bones porous, brittle, and susceptible to fractures.

If you look up the word Osteoporosis in the dictionary, or do a Google search, you'll see something like above in response.

However, other than hitting a nail with a hammer, the dictionary definition does a poor job at explaining things.