(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, more usually the screw; the latter as the internal, or female screw, or, more usually, the nut.
(n.) Specifically, a kind of nail with a spiral thread and a head with a nick to receive the end of the screw-driver. Screws are much used to hold together pieces of wood or to fasten something; -- called also wood screws, and screw nails. See also Screw bolt, below.
(n.) Anything shaped or acting like a screw; esp., a form of wheel for propelling steam vessels. It is placed at the stern, and furnished with blades having helicoidal surfaces to act against the water in the manner of a screw. See Screw propeller, below.
(n.) A steam vesel propelled by a screw instead of wheels; a screw steamer; a propeller.
(n.) An extortioner; a sharp bargainer; a skinflint; a niggard.
(n.) An instructor who examines with great or unnecessary severity; also, a searching or strict examination of a student by an instructor.
(n.) A small packet of tobacco.
(n.) An unsound or worn-out horse, useful as a hack, and commonly of good appearance.
(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.
(n.) An amphipod crustacean; as, the skeleton screw (Caprella). See Sand screw, under Sand.
(v. t.) To turn, as a screw; to apply a screw to; to press, fasten, or make firm, by means of a screw or screws; as, to screw a lock on a door; to screw a press.
(v. t.) To force; to squeeze; to press, as by screws.
(v. t.) Hence: To practice extortion upon; to oppress by unreasonable or extortionate exactions.
(v. t.) To twist; to distort; as, to screw his visage.
(v. t.) To examine rigidly, as a student; to subject to a severe examination.
(v. i.) To use violent mans in making exactions; to be oppressive or exacting.
(v. i.) To turn one's self uneasily with a twisting motion; as, he screws about in his chair.
Example Sentences:
(1) Total excision and immediate reconstruction were done with alloplastic material fixated with microplates and screws.
(2) Two hundred and forty root canals of extracted single-rooted teeth were prepared to the same dimension, and Dentatus posts of equal size were cemented without screwing them into the dentine.
(3) The committee's findings include that the attacks were not extensively planned by the perpetrators; the intelligence community did a good job of warning about the risk of an attack but a bad job of summarizing the attack when it happened; the state department screwed up by not beefing up security at the mission; nobody blocked any military response; and that the Obama administration was slow to produce a paper trail but was generally not a sinister actor in the episode.
(4) The pedicle screw systems were always the most rigid.
(5) Closure is accomplished by suture of soft tissues and reattachment of the posterior trochanteric fragment with bone screws.
(6) Two of the 7 sets of iliosacral screws failed postoperatively (28%).
(7) An algorithm is implemented to determine the form and phase shift for inconsistent type II quadrupoles for any space group having glide or screw-axis translations which are not a consequence of lattice centering.
(8) It constitutes an alternative to Ender nailing, screw-plate, and nail-plate.
(9) Changes in radiostrontium clearance (SrC) and bone formation (tetracycline labeling) were observed in the femurs of skeletally mature dogs following the various operative steps involved in bone screw fixation.
(10) Several conventional internal fixation techniques and a three converging screw method were used.
(11) The criteria of failure of pedicular instrumentation or "death" of an implant were defined as 1) screw bending, 2) screw breakage, 3) infection, 4) loosening of implants, 5) any rod or plate hardware problems, or 6) removal of hardware due to a neurologic complication.
(12) Cadaver studies have been carried out and transpedicular screw position has been confirmed by computed tomography scan.
(13) In this study, we performed a series of in vitro tests to compare the breaking strength of plated bone analogues that used either unicortical or bicortical end screws.
(14) Successful treatment of scaphoid nonunions with screw fixation and cast-free after-treatment does not depend on the implant used but rather on careful case selection and precise surgical technique.
(15) The Herbert bone screw was initially developed for management of fractures of the carpal scaphoid.
(16) Plus, unlike planet-screwing fossil fuels, solar could actually be subsidy-free in a few years.
(17) The intensity-measuring device in both apparatuses has a mobile disk attached to a motionless axis by a spiral spring; the clamps have fixing screws in the butts of a spong.
(18) A variety of quality tests, of biomechanical screws, are used, before performing the operations, that flaws may be detected.
(19) Most fractures were fixed with interfragmentary screws and external fixators.
(20) To give variations in the peak flow-rate (from pulsatile to intermediate to non-pulsatile), three types of blood pump (piston-bellows, screw, and centrifugal) were applied to dogs.
Spiral
Definition:
(a.) Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
(a.) Winding round a cylinder or imaginary axis, and at the same time rising or advancing forward; winding like the thread of a screw; helical.
(a.) Of or pertaining to a spiral; like a spiral.
(a.) A plane curve, not reentrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole. Cf. Helix.
(a.) Anything which has a spiral form, as a spiral shell.
Example Sentences:
(1) Digestion is initiated in the gastric region by secretion of acid and pepsin; however, diversity of digestive enzymes is highest in the post-gastric alimentary canal with the greatest proteolytic activity in the spiral valve.
(2) Don't we by chance come across this reciprocal spiral perspective when two people distrust one another without actually showing it?
(3) A great deal of information about the spiral bacteria of the stomach has accumulated in the past 5 years.
(4) Somalia has faced drought; famine; decades of conflict, now involving the Islamist rebels of al-Shabaab among other groups; the absence of an effective, central authority; and spiralling food prices.
(5) Spiral neurons, their fibers and endings as well as inner and outer hair cells express NSE in the isolated organ of Corti in culture.
(6) The binding sites were mainly located on the stereocilia, the cuticular plate of hair cells, the head plates of Deiters' cells, fibrous structures in pillar cells, in the spiral limbus and tectorial membrane and basilar membrane, plasma membranes, mitochondria and the chromatin of various kinds of cells.
(7) When normalized with respect to scala cross-section, the process of tracer movement across the spiral ligament is similar in the basal and third turns.
(8) Tangent-screen studies uncovered neurasthenic spiral fields superimposed on hysterical tubular contractions of both eyes.
(9) The phi-model also gives the noble numbers and moreover orders them in a way that establishes connections with the morphogenetic principles used in models for pattern generation; the order has to do with the relative frequencies of the spiral patterns in nature.
(10) The row had been inflamed over the weekend by a series of leaks about the spiralling price of Gove's free schools and high costs of Clegg's free school meals, giving Labour ammunition to attack the government's education policy in Westminster.
(11) Spiral-like primary dendrites were found and the orientation of secondary dendrites changed.
(12) The main uterine, radial and spiral arteries were identified in all patients.
(13) In animals receiving passive (unstimulated) implants, morphometric analysis of spiral ganglion cell density showed no significant difference in ganglion cell survival between the implanted cochleas and the contralateral control ears.
(14) Later, these vacuoles were divided into numerous vesicular spiral formation-centers, producing micronemes at the apical pole of young merozoites.
(15) During more extended exposure (60 and 90 days) the changes in hair cells of the spiral organ, which included nuclear deformation and disintegration of chromatin, mitochondria and endoplasmic reticulum membranes, became irreversible and caused the decay of injured cells.
(16) The company's value lies in its FM licence for London, with the audience for its national AM licence spiralling downwards in recent years.
(17) The spiral reinforcement at the same time prevents compression of the vein by surrounding cicatricial tissue as well as an aneurysmatic extension of the transplant.
(18) The intensity-measuring device in both apparatuses has a mobile disk attached to a motionless axis by a spiral spring; the clamps have fixing screws in the butts of a spong.
(19) The balance is fragile and the threat of a spiral of decline is not an idle one.
(20) They ran in a spiral pattern in the distal part of the middle cerebral artery.