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 for Plug centerbit
From The Collaborative International Dictionary of English v.0.48 :

  Plug \Plug\, n. [Akin to D. plug, G. pflock, Dan. pl["o]k, plug,
     Sw. plugg; cf. W. ploc.]
     1. Any piece of wood, metal, or other substance used to stop
        or fill a hole; a stopple.
        [1913 Webster]
     2. A flat oblong cake of pressed tobacco. [U. S.]
        [1913 Webster]
     3. A high, tapering silk hat. [Slang, U.S.]
        [1913 Webster]
     4. A worthless horse. [Slang, U.S.]
        [1913 Webster]
     5. (Building) A block of wood let into a wall, to afford a
        hold for nails.
        [1913 Webster]
     6. An act of plugging[6]; a brief mention for the sake of
        publicity or advertisement, especially during a public
        event not specifically intended for advertising purposes;
        as, he put in a plug for his favorite charity.
     Breech plug (Gun.), in breech-loading guns, the metal plug
        or cylinder which closes the aperture in the breech,
        through which the gun is loaded.
     Fire plug, a street hydrant to which hose may be attached.
        [U. S.]
     Hawse plug (Naut.), a plug to stop a hawse hole.
     Plug and feather. (Stone Working) See Feather, n., 7.
     Plug centerbit, a centerbit ending in a small cylinder
        instead of a point, so as to follow and enlarge a hole
        previously made, or to form a counterbore around it.
     Plug rod (Steam Eng.), a rod attached to the beam for
        working the valves, as in the Cornish engine.
     Plug valve (Mech.), a tapering valve, which turns in a case
        like the plug of a faucet.
        [1913 Webster]

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