
 Ductor is an extinct genus of prehistoric bony fish that lived from the early to middle Eocene. Fossils have been found in Monte Bolca. In life, species of Ductor would have resembled pilot fish, though, they are more closely related to the jackfish. Some experts place Ductor into its own family, `Ductoridae,` while others place the genus within.....
Found on 
http://en.wikipedia.org/wiki/Ductor

• (n.) A contrivance for removing superfluous ink or coloring matter from a roller. See Doctor, 4. • (n.) One who leads.
Found on 
http://thinkexist.com/dictionary/meaning/ductor/
 Duc'tor  noun
Duc'tor  noun [ Latin , from 
 ducere to lead.] 
 1.  One who leads. [ Obsolete] 
 Sir T. Browne.   2.  (Machinery) A contrivance for removing superfluous ink or coloring matter from a roller. See 
 Doctor , 4. 
 Knight.   Ductor roller  (Printing) , ...
Found on 
http://www.encyclo.co.uk/webster/D/128

the roller that conveys ink in a press from the ink reservoir to the distributor.
Found on 
https://www.infoplease.com/dictionary/ductor
  No exact match found.