ductor

Etymology
From, agent noun of.

Noun

 * 1)  One who leads.
 * 2)  A device, usually in the form of an oscillating roller, for transferring ink from a source to the ink train rollers in a controlled manner.
 * 3) * 1883, Andrew Overend, "Inking apparatus for printing-machines", US patent US363760, filed 9 November 1883, issued 24 May 1887.
 * The combination, with a fountain-roller and an ink-cylinder, of a ductor movable between said roller and cylinder for delivering ink from one to the other...
 * The combination, with a fountain-roller and an ink-cylinder, of a ductor movable between said roller and cylinder for delivering ink from one to the other...

Etymology
From.

Noun

 * 1) leader; e.g., king, chieftain, prince, etc.
 * 2) commander, general
 * 3)  iron worker (one who draws out)
 * 1)  iron worker (one who draws out)

Etymology
From.

Noun

 * 1) guide, conductor
 * 2) probe