from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A generalized reduction in bone mass that is less severe than that resulting from osteoporosis, caused by the resorption of bone at a rate that exceeds bone synthesis.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The medical condition of having low bone density, but not low enough to be considered osteoporosis.
osteo- + -penia (Wiktionary)