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Definition of SCREW
a: a simple machine of the inclined plane type consisting of a spirally grooved solid cylinder and a correspondingly grooved hollow cylinder into which it fits
b: a nail-shaped or rod-shaped piece with a spiral groove and a slotted or recessed head designed to be inserted into material by rotating (as with a screwdriver) and used for fastening pieces of solid material together
a (1): to attach, fasten, or close by means of a screw (2): to unite or separate by means of a screw or a twisting motion (3): to press tightly in a device (as a vise) operated by a screw (4): to operate, tighten, or adjust by means of a screw (5): to torture by means of a thumbscrew
b: to furnish with a spiral groove or ridge :thread
: to increase the intensity, quantity, or capability of <trying to screw up courage to confess — Will Scott>
a (1): to mistreat or exploit through extortion, trickery, or unfair actions; especially: to deprive of or cheat out of something due or expected (2): to treat so as to bring about injury or loss (as to a person's reputation) <use the available Federal machinery to screw our political enemies — J. W. Dean III> —often used as a generalized curse <screw you!>
b: to extract by pressure or threat
usually vulgar: to copulate with
: to rotate like or as a screw
: to turn or move with a twisting or writhing motion
: a threaded device used in bone surgery for fixation of parts (as fragments of fractured bones)
In machine construction, a usually circular cylindrical member with a continuous spiral rib or thread, used either as a fastener or as a force and motion modifier. Various types of screws are used to clamp machine parts together. Wood screws are made in a wide variety of diameters and lengths; when using wood screws, small starting holes called pilot holes are often drilled first to avoid splitting the wood. Screws that modify force and motion are known as power screws. The screw is considered one of the five simple machines. See alsowedge.