Dictionary.net

The bonelike rigid connective tissue covering the root of a tooth from the cementoenamel junction to the apex and lining the apex of the root canal, also assisting in tooth support by serving as attachment structures for the periodontal ligament. (Jablonski, Dictionary of Dentistry, 1992)

The osteoblasts concerned in the formation of the cement of the teeth; the cement corpuscles of the fully formed teeth. [Lat.]