The Collaborative International Dictionary
Plug \Plug\, n. [Akin to D. plug, G. pflock, Dan. pl["o]k, plug, Sw. plugg; cf. W. ploc.]
Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
A flat oblong cake of pressed tobacco. [U. S.]
A high, tapering silk hat. [Slang, U.S.]
A worthless horse. [Slang, U.S.]
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(Building) A block of wood let into a wall, to afford a hold for nails.
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.
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.
Usage examples of "breech plug".
Ryan asked, squinting along the chased barrel of a superb saw-handled dueling pistol, still carrying the maker's gold cartouche on the breech plug.
He has to take the lock off the gun and the barrel off the stock, then clamp down the barrel and unscrew the breech plug—.
He has to take the lock off the gun and the barrel off the stock, then clamp down the barrel and unscrew the breech plug.