Ductor \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.