Bone mineral density or BMD is the mineral mass of a bone divided by its area.
BMD is defined as mass of mineral per unit volume. Therefore, it reflects the degree of mineralization of bone.
You will most likely see this term in association with your bone density scan or DXA data. For each bone region scanned the BMD is calculated by dividing the measured bone mineral content (BMC) by bone area. It is a two-dimensional assessment rather than three-dimensional of the scanned bone region. Therefore, the results may be influenced by bone and body size.