Definition of screw
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Screw (n.) A cylinder, or a cylindrical perforation, having a continuous rib, called the thread, winding round it spirally at a constant inclination, so as to leave a continuous spiral groove between one turn and the next, -- used chiefly for producing, when revolved, motion or pressure in the direction of its axis, by the sliding of the threads of the cylinder in the grooves between the threads of the perforation adapted to it, the former being distinguished as the external, or male screw, or,
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Nut ::
Nut (n.) A perforated block (usually a small piece of metal), provided with an internal or female screw thread, used on a bolt, or screw, for tightening or holding something, or for transmitting motion. See Illust. of lst Bolt..
Counterbore ::
Counterbore (n.) A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head..
Well ::
Well (v. i.) A vertical passage in the stern into which an auxiliary screw propeller may be drawn up out of water.
Turn-buckle ::
Turn-buckle (n.) A loop or sleeve with a screw thread at one end and a swivel at the other, -- used for tightening a rod, stay, etc..
Worm ::
Worm (n.) A short revolving screw, the threads of which drive, or are driven by, a worm wheel by gearing into its teeth or cogs. See Illust. of Worm gearing, below..
Spanner ::
Spanner (n.) An iron instrument having a jaw to fit a nut or the head of a bolt, and used as a lever to turn it with; a wrench; specifically, a wrench for unscrewing or tightening the couplings of hose..
Terminal ::
Terminal (n.) Either of the ends of the conducting circuit of an electrical apparatus, as an inductorium, dynamo, or electric motor, usually provided with binding screws for the attachment of wires by which a current may be conveyed into or from the machine; a pole..
Breech Screw ::
Breech screw () A strong iron or steel plug screwed into the breech of a musket or other firearm, to close the bottom of the bore..
Clamp ::
Clamp (n.) An instrument with a screw or screws by which work is held in its place or two parts are temporarily held together.
Screw ::
Screw (n.) An instructor who examines with great or unnecessary severity; also, a searching or strict examination of a student by an instructor..
Screw ::
Screw (n.) A straight line in space with which a definite linear magnitude termed the pitch is associated (cf. 5th Pitch, 10 (b)). It is used to express the displacement of a rigid body, which may always be made to consist of a rotation about an axis combined with a translation parallel to that axis..
Screw-driver ::
Screw-driver (n.) 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.
Jack ::
"Jack (n.) A portable machine variously constructed, for exerting great pressure, or lifting or moving a heavy body through a small distance. It consists of a lever, screw, rack and pinion, hydraulic press, or any simple combination of mechanical powers, working in a compact pedestal or support and operated by a lever, crank, capstan bar, etc. The name is often given to a jackscrew, which is a kind of jack..
Hub ::
Hub (n.) A screw hob. See Hob, 3..
Blade ::
Blade (n.) The broad part of an oar; also, one of the projecting arms of a screw propeller..
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