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of the perforation adapted to it, the former being distinguished as the external, or male screw, or, more usually the screw; the latter as the internal, or female screw, or, more usually, the nut.

Adapted for forming a screw by cutting; as, a screw-cutting lathe.

A tool for turning screws so as to drive them into their place. It has a thin end which enters the nick in the head of the screw.

One who, or that which, screws.

a. & n. from Screw, v. t. Screwing machine. See Screw machine, under Screw.

A long screw formerly used to fasten a bedpost to one of the adjacent side pieces.

A set screw used to bind parts together, esp. one for making a connection in an electrical circuit.

A corkscrew. Swift.

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

An instrument with a screw or a steel spiral for drawing corks from bottles. Corkscrew starts, a spiral staircase around a solid newel.

A screw cut on a solid whose sides are arcs of the periphery of a wheel into the teeth of which the screw is intended to work. It is named from the person who first used the form.

A jack in which a screw is used for lifting, or exerting pressure. See Illust. of 2d Jack, n., 5.

A screw link, to which is attached the rope of a rope-drilling apparatus, for feeding and slightly turning the drill jar at each stroke.

A screw having a flat-sided or knurled head, so that it may be turned by the thumb and forefinger.

A propeller screw placed in front of the supporting planes of an aëroplane instead of behind them, so that it exerts a pull instead of a push. Hence, Tractor monoplane, Tractor biplane, etc.

To draw the screws from; to loose from screws; to loosen or withdraw (anything, as a screw) by turning it.

A screw propeller.

o Archimedes, a celebrated Greek philosopher; constructed on the principle of Archimedes' screw; as, Archimedean drill, propeller, etc. Archimedean screw, or Archimedes' screw, an instrument, said to have been invented by Archimedes, for raising water, formed by winding a flexible tube round a cylinder in the form of a…

tinct genus of Bryzoa characteristic of the subcarboniferous rocks. Its form is that of a screw.

nds. A pod auger is one with a straight channel or groove, like the half of a bean pod. A screw auger has a twisted blade, by the spiral groove of which the chips are discharge.