A device or substance that conducts or guides something, or a person who leads or directs.
From Latin ductor, meaning 'leader' or 'one who leads,' derived from ducere 'to lead.' The term was adapted into English technical vocabulary for devices that guide or conduct materials or forces.
In printing, a ductor roller helps distribute ink evenly across printing plates—it's literally doing what its Latin name suggests by 'leading' the ink where it needs to go.
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