bone density

noun

variants also bone mineral 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

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

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