Cellular Automata: an array of identically programmed cells, which interact with one another.


Cell engineering: -- deliberate artificial modifications to biological cellular systems on a cell-by-cell basis.


Cell Repair Machine: Molecular and nanoscale machines with sensors, nanocomputers and tools, programmed to detect and repair damage to cells and tissues, which could even report back to and receive instructions from a human doctor if needed. 


Chemical Vapour Deposition (CVD): a technique used to deposit coatings, where chemicals are first vaporized, and then applied using an inert carrier gas such as nitrogen. 


Cobots: Collaborative robots designed to work alongside human operators.


Computational Nanotechnology: permits the modelling and simulation of complex nanometer-scale structures. The predictive and analytical power of computation is critical to success in nanotechnology.


Computronium: A highly (or optimally) efficient matrix for computation.


Conjugation: -- biology, the union of two unicellular organisms accompanied by an interchange of nuclear material, as in Paramecium.


Convergent Assembly: Manufacture of metre sized products building blocks of nanometer size. It is based on the idea that smaller parts can be assembled into larger parts, larger parts can be assembled into still larger parts, and so forth. This process can be systematically repeated in a hierarchical fashion, creating an architecture able to span the size range from the molecular to the macroscopic.


Cytocide: -- the killing of living cells.


Cytography: -- a physical description (and mapping) of the living cell.


Cytoidentification: -- identification of cell type.


Cytometrics: -- the quantitative measurement of cell sizes, shapes, structures, and numbers.


Cytotomography: -- tomographic imaging of an individual cell.