Dictionary » S » Screw

Screw

screw

1. 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.

2. To force; to squeeze; to press, as by screws. But screw your courage to the sticking place, And we'll not fail. (Shak)

3. Hence: To practice extortion upon; to oppress by unreasonable or extortionate exactions. Our country landlords, by unmeasureable screwing and racking their tenants, have already reduced the miserable people to a worse condition than the peasants in France. (swift)

4. To twist; to distort; as, to screw his visage. He screwed his face into a hardened smile. (Dryden)

5. To examine rigidly, as a student; to subject to a severe examination. To screw out, to press out; to extort. To screw up, to force; to bring by violent pressure. To screw in, to force in by turning or twisting.

Origin: Screwed; Screwing.

1. 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.

The screw, as a mechanical]] power, is a modification of the inclined plane, and may be regarded as a right-angled triangle wrapped round a cylinder, the hypotenuse of the marking the spiral thread of the screw, its base equaling the circumference of the cylinder, and its height the pitch of the thread.

2. 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.

3. Anything shaped or acting like a screw; especially, 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.

4. A steam vesel propelled by a screw instead of wheels; a screw steamer; a propeller.

5. An extortioner; a sharp bargainer; a skinflint; a niggard.

6. An instructor who examines with great or unnecessary severity; also, a searching or strict examination of a student by an instructor.

7. A small packet of tobacco.

8. An unsound or worn-out horse, useful as a hack, and commonly of good appearance.

9. (Science: mathematics) A straight line in space with which a definite linear magnitude termed the pitch is associated (cf. 5th Pitch, 10). 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.

10. (Science: zoology) An amphipod crustacean; as, the skeleton screw (Caprel 1000 la). See sand screw, under Sand. Archimedes screw, compound screw, foot screw, etc. See Archimedes, Compound, Foot, etc. A screw loose, something out of order, so that work is not done smoothly; as, there is a screw loose somewhere. Endless, or perpetual screw, a screw used to give motion to a toothed wheel by the action of its threads between the teeth of the wheel; called also a worm. Lag screw. See Lag. Micrometer screw, a screw with fine threads, used for the measurement of very small spaces. Right and left screw, a screw having threads upon the opposite ends which wind in opposite directions. Screw alley. See shaft alley. Screw bean.

(Science: botany) The larva of an American fly (Compsomyia macellaria), allied to the blowflies, which sometimes deposits its eggs in the nostrils, or about wounds, in man and other animals, with fatal results. Screw wrench. A wrench for turning a screw. A wrench with an adjustable jaw that is moved by a screw. To put the screw, or screws, on, to use pressure upon, as for the purpose of extortion; to coerce. To put under the screw or screws, to subject to presure; to force. Wood screw, a metal screw with a sharp thread of coarse pitch, adapted to holding fast in wood.

Origin: OE. Scrue, OF. Escroue, escroe, female screw, F. Ecrou, L. Scrobis a ditch, trench, in LL, the hole made by swine in rooting; cf. D. Schroef a screw, G. Schraube, Icel. Skrfa.


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Role of membranes in synthesis of ATP in cellular respiratio

... synthesis in both the election transport chain and chemiosmosis, two events that are absolutely critical for aerobic respiration in cells. Did I screw up and facts somewhere?

See entire post
by mkbeast99
Wed Aug 15, 2012 11:12 pm
 
Forum: Molecular Biology
Topic: Role of membranes in synthesis of ATP in cellular respiratio
Replies: 1
Views: 14345

Re: GI tract and enteric nervous system

... to send sensory information back, called afferent pathway. The autonomic is more complex and contains both efferent and afferent pathways. Just to screw students up, researchers decided that they woulld split the autonomic system up into parasympathetic and sympathetic systems. Further they thought ...

See entire post
by daniel.kurz
Fri Oct 28, 2011 6:31 am
 
Forum: Human Biology
Topic: GI tract and enteric nervous system
Replies: 1
Views: 6365

Yeast experiment

... time as well. So my questions are 1.)Which set of questions are correct - my predictions or the experiment (that both evolved CO2)? 2.)did I screw up the experiment? 3.)If I did not screw up, and am misreading my results, then what's the point of the nonsugar yeast in the experiment? 4.) ...

See entire post
by gwuc4
Mon Jun 06, 2011 6:28 am
 
Forum: General Discussion
Topic: Yeast experiment
Replies: 3
Views: 3841

i want information about choromosomes

... adult, the standard gene therapies have this limitation of one cell only, or a few of cells. Assuming the gene insertion succeeds(more often they screw up) there is always the issue of not producing enough insulin just because you only have a few cell active. So does this mean gene therapy sucks, ...

See entire post
by david23
Sun Apr 11, 2010 7:39 pm
 
Forum: General Discussion
Topic: i want information about choromosomes
Replies: 6
Views: 3209

Re: Biology Lab Help - Protein Assays

... useful. The Bradford assay is also less sensitive to chemicals used in sample preparations (like lysis buffer components, though too much SDS can screw it up). If I purify protein by some sort of affinity purification (GST, 6xHIS, immunoprecipitation, etc), I can often measure concentration of ...

See entire post
by clevermizo
Wed Feb 03, 2010 5:37 pm
 
Forum: Molecular Biology
Topic: Biology Lab Help - Protein Assays
Replies: 4
Views: 5078
View all matching forum results

This page was last modified 21:16, 3 October 2005. This page has been accessed 5,215 times. 
What links here | Related changes | Permanent link