1. Any substance used for making bodies adhere to each other, as mortar, glue, etc.
2. A kind of calcined limestone, or a calcined mixture of clay and lime, for making mortar which will harden under water.
3. The powder used in cementation. See Cementation, n., 2.
4. Bond of union; that which unites firmly, as persons in friendship, or men in society. "The cement of our love."
5. (Anat.) The layer of bone investing the root and neck of a tooth; -- called also cementum.
See under Hydraulic.