bone [%PREMIUM_LINK%] (bōn) Pronunciation Key |
The hard, dense, calcified tissue that forms the skeleton of most vertebrates, consisting of a matrix made up of collagen fibers and mineral salts. There are two main types of bone structure: compact, which is solid and hard, and cancellous, which is spongy in appearance. Bone serves as a framework for the attachment of muscles and protects vital organs, such as the brain, heart, and lungs. See more at osteoblast, osteocyte.
Any of the structures made of bone that constitute a skeleton, such as the femur. The human skeleton consists of 206 bones.