bone density

:  the amount of mineral content per unit volume of bone Bisphosphonates increase bone density by adding minerals to bones.—Jane E. Brody, The New York Times, 5 Apr. 2005 Numerous studies indicate that weight bearing exercise versus non-weight-bearing exercise increases bone density in women younger than 35.—M. R. Hiller, The Springfield (Massachusetts) Union News, 19 Feb. 1993; also :  a measurement of this mineral content used to determine the strength of bone and especially to detect osteoporosis … women considered to be at increased risk of osteoporotic fracture on the basis of a low base-line bone density.—Richard L. Prince et al., The New England Journal of Medicine, 24 Oct. 1991