D defs.my
Entry 2 senses Webster, 1913

Ductor

· Duc·tor · IPA /ˈdʌktə(ɹ)/
01 n. One who leads.
  1. 1.
    One who leads.[Obs.]
  2. 2.
    A contrivance for removing superfluous ink or coloring matter from a roller. See Doctor, 4.(Mach.) See: Doctor
Phrases & compounds
Ductor roller — the roller which conveys or supplies ink to another roller.