\Duc"tor\, n. [L., fr. ducere to lead.]
1. One who leads. [Obs.] --Sir T. Browne.
2. (Mach.) A contrivance for removing superfluous ink or
   coloring matter from a roller. See {Doctor}, 4. --Knight.
{Ductor roller} (Printing), the roller which conveys or
   supplies ink to another roller. --Knight.