Cement

1. The layer of bone investing the root and neck of a tooth; -- called also cementum.
2. To unite firmly or closely.
3. To unite or cause to adhere by means of a cement.
4. To overlay or coat with cement; as, to cement a cellar bottom.
5. The powder used in cementation. See Cementation, n., 2.
6. A kind of calcined limestone, or a calcined mixture of clay and lime, for making mortar which will harden under water.
7. To become cemented or firmly united; to cohere.
8. Any substance used for making bodies adhere to each other, as mortar, glue, etc.
9. Bond of union; that which unites firmly, as persons in friendship, or men in society.