a specialized bony substance covering the root of a tooth
同义词：cement
cementum详细解释
ce.men.tum n.（名词）A bonelike substance covering the root of a tooth.牙骨质：一种覆盖住牙根的骨状物质 来源：New Latin 现代拉丁语 from Latin caementum [rough stone] * see cement 源自 拉丁语 caementum [粗糙的石头] *参见 cement
