screw

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screw

(skrū),
A helically grooved cylinder for fastening two objects together or for adjusting the position of an object resting on one end of the screw.

screw

[skro̅o̅]
Etymology: MFr, escroue
a solid cylinder with a helical thread on its exterior surface, used to hold two objects together.

screw

Orthopedics
noun A threaded internal fixation device, usually constructed of stainless steel, commonly used to fix bones in place, either alone or with a plate.
 
Vox populi
verb Popular, to treat unfairly.

screw

noun Orthopedics A ubiquitous threaded internal fixation device, usually constructed of stainless steel, commonly used to fix bones in place, either alone or with a plate. See Bionx absorbable cannulated screw, Cancellous screw, Cannellated screw, Cortical screw, Cross-locking screw, Herbert screw, Interference screw, Lag screw Vox populi verb
1. Popular, 'to treat unfairly'.
2. Vulgar; to have intercourse.

screw

(skrū)
Helically grooved cylinder for attaching two objects or adjusting position of an object resting on one end of screw.

screw

1. a mechanical device for fixing one object to another, characterized by a spiral ridge cut on the external surface of a cylindrical rod of decreasing diameter towards its point. This is a male screw. In a female screw the screw is cut on the inside of a cylindrical cavity.
2. a colloquial term for a worn out or inferior horse.

AISF bone screw
see buttress thread bone screw.
buttress thread bone screw
the thread is not a simple V as in the standard thread but has one side of the groove at right angles to the direction of the screw and the other side at a 45° angle. Called also AISF, Howmett compression, Richards-Bechtol.
cancellous bone screw
has a coarse thread; threaded to only the first third of the length of the screw.
cortical screw
threaded the full length of the screw; fine thread to hold in dense bone.
Howmett compression bone screw
see buttress thread bone screw.
lag bone screw
used as a compressing unit between two fragments with the first half of the screw near the point threaded, with the diameter of the ridges greater than that of the unthreaded half near the head. As the ridged part of the screw bites in the walls of the drill hole in the distal fragment, the unthreaded part is free to move within the drill hole in the proximal fragment, thus compressing the two pieces of bone together.
Richards-Bechtol bone screw
see buttress thread bone screw (above).
standard bone screw
with a V thread the full length of the screw, with a single slot, cruciate or Phillips head.
transfixation screw
orthopedic screw used to reattach bone fragments to a solid skeletal part. The proximal part near the head is not threaded and needs to be of a smaller diameter than the threaded portion nearer the tip.
References in classic literature ?
But we must hope that he will perceive and turn a second screw, which will have the effect of bringing the horse back to earth.
Then he began to think it was time to come down, and took for granted that, in order to do this, it was only needful to turn the screw the reverse way; but, to his surprise and horror, he found that, turn as he might, he did not make the smallest impression.
At last, when it was growing dark, I found another screw, and on turning it, the horse began slowly to sink towards the earth.
He mounted first and helped the princess up behind; then, when she was firmly seated, with her hands holding tightly to his belt, he touched the screw, and the horse began to leave the earth quickly behind him.
The screw consists of an axis of hollow brass tube, eighteen inches in length, through which, upon a semi-spiral inclined at fifteen degrees, pass a series of steel wire radii, two feet long, and thus projecting a foot on either side.
The rudder is also very much larger, in proportion, than that of the model ; and the screw is considerably smaller.
Osborne's seat, about a mile from Penstruthal, in North Wales ; and at 7 minutes past 11, every thing being ready for departure, the balloon was set free, rising gently but steadily, in a direction nearly South ; no use being made, for the first half hour, of either the screw or the rudder.
The steel rod connecting the spring with the propeller was suddenly jerked out of place, at the car end, (by a swaying of the car through some movement of one of the two seamen we had taken up,) and in an instant hung dangling out of reach, from the pivot of the axis of the screw.
It has veered, however, very considerably to the north ; and now, at sundown, we are holding our course due west, principally by the screw and rudder, which answer their purposes to admiration.
The next morning, February 21st, at three o'clock, the furnaces began to roar; at five, the anchors were weighed, and the Resolute, powerfully driven by her screw, began to plough the water toward the mouth of the Thames.
Ishmael Pickup, now commands me to be equally discreet on the kindred subject of Half-Crown-making, under the auspices of Old File, Young File, Mill, and Screw.
Each selected feed device has a range of available screws with different diameters and pitches.