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From The Collaborative International Dictionary of English v.0.48:
Driver \Driv"er\, n. [From Drive.] 1. One who, or that which, drives; the person or thing that urges or compels anything else to move onward. [1913 Webster] 2. The person who drives beasts or a carriage; a coachman; a charioteer, etc.; hence, also, one who controls the movements of a any vehicle. [1913 Webster +PJC] 3. An overseer of a gang of slaves or gang of convicts at their work. [1913 Webster] 4. (Mach.) A part that transmits motion to another part by contact with it, or through an intermediate relatively movable part, as a gear which drives another, or a lever which moves another through a link, etc. Specifically: (a) The driving wheel of a locomotive. (b) An attachment to a lathe, spindle, or face plate to turn a carrier. (c) A crossbar on a grinding mill spindle to drive the upper stone. [1913 Webster] 5. (Naut.) The after sail in a ship or bark, being a fore-and-aft sail attached to a gaff; a spanker. --Totten. [1913 Webster] 6. An implement used for driving; as: (a) A mallet. (b) A tamping iron. (c) A cooper's hammer for driving on barrel hoops. (d) A wooden-headed golf club with a long shaft, for playing the longest strokes. [Webster 1913 Suppl.] Driver ant (Zool.), a species of African stinging ant; one of the visiting ants (Anomma arcens); -- so called because they move about in vast armies, and drive away or devour all insects and other small animals. [1913 Webster]