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A block of wood let into a wall, to afford a hold for nails. 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…

A switchboard in which connections are made by means of plugs.

One who, or that which, plugs.

The act of stopping with a plug.

A plug fitted to the fuse hole of a shell to hold the fuse.

In internal-combustion engines with electric ignition, a plug, screwed into the cylinder head, having through it an insulated wire which is connected with the induction coil or magneto circuit on the outside, and forms, with another terminal on the base of the plug, a spark gap inside the cylinder.

A strong iron or steel plug screwed into the breech of a musket or other firearm, to close the bottom of the bore.

Leaf tobacco softened, sweetened, and pressed into plugs or cakes. Cut cavendish, the plugs cut into long shreds for smoking.

s (usually a pinch of nickel and silver filings in equal parts) between terminal wires or plugs (called conductor plugs).

A plug of some substance lodged in a blood vessel, being brought thither by the blood current. It consists most frequently of a clot of fibrin, a detached shred of a morbid growth, a globule of fat, or a microscopic organism.

red; -- called also tap, and cock. It consists of a tubular spout, stopped with a movable plug, spigot, valve, or slide.

A thin wedge driven between the two semicylindrical parts of a divided plug in a hole bored in a stone, to rend the stone. Knight.

r holding or conveying fire, especially the receptacle for the priming of a gun. -- Fire plug, a plug or hydrant for drawing water from the main pipes in a street, building, etc., for extinguishing fires. -- Fire policy, the writing or instrument expressing the contract of insurance against loss by fire. -- Fire pot…

y cock, a cock connected with four pipes or ports, and having two or more passages in the plug, by which the adjacent pipes or ports may be made to communicate; formerly used as a valve in the steam engine, and now for various other purposes. In the illustration, a leads to the upper end of a steam engine cylinder, and…

nd two of tin, which melts at a temperature below that of boiling water. Ure. -- Fusible plug (Steam Boiler), a piece of easily fusible alloy, placed in one of the sheets and intended to melt and blow off the steam in case of low water.

A device, as a loosely fitted plug, which is driven through a pipe by the pressure of the contents behind the plug to clear away obstructions.

imp. & p. p. of Grind. Ground cock, a cock, the plug of which is ground into its seat, as distinguished from a compression cock. Knight. -- Ground glass, glass the transparency of which has been destroyed by having its surface roughened by grinding. -- Ground joint, a close joint made by grinding together two pieces,…

ether. -- Hawse block, a block used to stop up a hawse hole at sea; -- called also hawse plug. -- Hawse hole, a hole in the bow of a ship, through which a cable passes. -- Hawse piece, one of the foremost timbers of a ship, through which the hawse hole is cut. -- Hawse plug. Same as Hawse block (above). -- To come…

with a valve and spout at which water may be drawn from the mains of waterworks; a water plug.

A conical rifle bullet, with a cavity in its base plugged with a piece of iron, which, by the explosion of the charge, is driven farther in, expanding the sides to fit closely the grooves of the barrel.