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icket; a through train. Also, admitting of passage through; as, a through bridge. Through bolt, a bolt which passes through all the thickness or layers of that which it fastens, or in which it is fixed. -- Through bridge, a bridge in which the floor is supported by the lower chords of the tissues instead of the upper,…

The discharge of electricity; a thunderbolt. [Obs.] The revenging gods 'Gainst parricides did all their thunders bend. Shak.

A thunderbolt, -- formerly believed to be a stone. Fear no more the lightning flash, Nor the all-dreaded thunderstone. Shak.

A lateral projection at one end, or between the ends, of a piece, as a rod or bolt, by means of which it is moved.

A large ironbound block strapped with a hook, and, when used, hung to an eyebolt in the cap, -- used in swaying and lowering the topmast. Totten.

One of the principal transverse timbers of the stern, bolted to the sternpost and giving shape to the stern structure; -- called also transsummer.

f timber or metal around the shaft of a mine; especially, a series of cast-iron cylinders bolted together, used to enable those who sink a shaft to penetrate quicksand, water, etc., with safety.

like, which must be adjusted to a particular position by a key or other means before the bolt can be thrown in locking or unlocking.

To remove a bar or bars from; to unbolt; to open; as, to unbar a gate. Heber.

To unbolt; to unbar; to open. You shall not unbarricade the door. J. Webster (1623).

An arrow or bolt for a crossbow having feathers or brass placed at an angle with the shaft to make it spin in flying.

A timber bolted to a row of piles to secure them together and in position. Knight.

leather, or other material, or a perforated plate, used for various purposes, as around a bolt or screw to form a seat for the head or nut, or around a wagon axle to prevent endwise motion of the hub of the wheel and relieve friction, or in a joint to form a packing, etc.

fice either at the end or between the ends, for exerting a twisting strain, as in turning bolts, nuts, screw taps, etc.; a screw key. Many wrenches have adjustable jaws for grasping nuts, etc., of different sizes.

A strong piece of plank used in applying wringbolts.