screen


screen
1. A sheet of any substance used to shield an object from any influence, such as heat, light, x-rays, etc. 2. A sheet upon which an image is projected. 3. Formerly, to make a fluoroscopic examination. 4. In psychoanalysis, concealment, as one image or memory concealing another. SEE ALSO: s. memory. 5. To examine, evaluate; to process a group to select or separate certain individuals from it. 6. A thin layer of crystals that converts x-rays to light photons to expose film; used in a cassette to produce radiographic images on film. [Fr. écran]
- Bjerrum s. SYN: tangent s..
- s.-film contact the closeness and uniformity with which the x-ray film in a cassette lies against the s. (6). Image resolution is dependent on this property.
- fluorescent s. a s. coated with fluorescent crystals such as the calcium tungstate used in the fluoroscope.
- Hess s. a s. used in the measurement of ocular deviation.
- intensifying s. a s. (6) used in radiography.
- multiple marker s. use of two or more markers in the maternal serum to determine the relative risk of an abnormal fetus. SEE ALSO: triple s..
- rare-earth s. an intensifying s. (6) made of a rare-earth oxide phosphor, more efficient than calcium tungstate, especially at the higher kilovoltages used in modern radiography.
- tangent s. a flat, usually black surface used to measure the central 30 degrees of the field of vision. SYN: Bjerrum s..
- triple s. test of maternal serum α-fetoprotein, chorionic gonadotropin, and unconjugated estrogen for indications of increased risk of fetal abnormality, especially trisomy 21.
- vestibular s. a s. made of acrylic resin that covers the labial or buccal surfaces of one or both dental arches; used to treat oral habits and to stimulate tooth movement by using perioral muscle force.

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screen 'skrēn vt to test or examine for the presence of something (as a disease) <\screen patients for prostate cancer> <a test to \screen donor blood for HIV and hepatitis C (Penni Crabtree)>

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(skrēn) 1. a structure resembling a curtain or partition, used as a protection or shield, e.g., against excessive radiation exposure; see also shield. 2. a large flat surface upon which light rays are projected. 3. protective (def. 2). 4. to examine by fluoroscopy (Great Britain). 5. to separate well individuals in a population from those who have an undiagnosed disease, defect, or other pathologic condition or who are at high risk, by means of tests, examinations, or other procedures. See also screening.

Medical dictionary. 2011.

Synonyms:

Look at other dictionaries:

  • Screen — (skr[=e]n), n. [OE. scren, OF. escrein, escran, F. [ e]cran, of uncertain origin; cf. G. schirm a screen, OHG. scirm, scerm a protection, shield, or G. schragen a trestle, a stack of wood, or G. schranne a railing.] 1. Anything that separates or… …   The Collaborative International Dictionary of English

  • screen — [skrēn] n. [ME skrene, sieve, curtain < OFr escren < Gmc, as in OHG scerm (Ger shirm), guard, protection, screen < IE base * (s)ker , to cut > SHEAR, SCORE] 1. a) a light, movable, covered frame or series of frames hinged together,… …   English World dictionary

  • Screen — [skri:n ], der; s, s [engl. screen] (EDV): engl. Bez. für: Bildschirm. * * * Screen   [engl.], Bildschirm. * * * Screen [skri:n], der; s, s [engl. screen] (EDV): engl. Bez. für Bildschirm …   Universal-Lexikon

  • Screen — (skr[=e]n), v. t. [imp. & p. p. {Screened}; p. pr. & vb. n. {Screening}.] 1. To provide with a shelter or means of concealment; to separate or cut off from inconvenience, injury, or danger; to shelter; to protect; to protect by hiding; to… …   The Collaborative International Dictionary of English

  • Screen — steht für Bildschirm, allgemein eine visuelle Anzeigevorrichtung Computermonitor, ein Peripheriegerät GNU Screen, Fenstermanager zur Verwendung mit textbasierten Eingabefenstern Screen (Fernsehsendung), ein ehemaliges Kino und DVD Magazin Siehe… …   Deutsch Wikipedia

  • screen — (izg. skrȋn) m DEFINICIJA inform. ekran, zaslon SINTAGMA screen saver (izg. screen sèjver) inform. program koji se automatski pokreće nakon što je računalo neko vrijeme bilo u mirovanju radi sprečavanja pojave zapečenog ekrana; zaštitnik ekrana… …   Hrvatski jezični portal

  • screen — [n] protection used in or as furniture, motion picture display awning, canopy, cloak, concealment, cover, covering, curtain, divider, envelope, guard, hedge, mantle, mask, net, partition, security, shade, shelter, shield, shroud, veil; concepts… …   New thesaurus

  • screen — ► NOUN 1) an upright partition used to divide a room, give shelter, or provide concealment. 2) something that provides shelter or concealment. 3) the surface of a cathode ray tube or similar electronic device, especially that of a television, VDU …   English terms dictionary

  • Screen 3 — was a Post punk Band (1980 1984, 1990 1992)The original line up formed in 1980 (heavily influenced by early Cure) and was: *Neil Dyer (guitar and vocals) *Richard Kett (bass) *Brett Cooper (drums) then added two trumpet players in late 1981:… …   Wikipedia

  • screen — I (guard) verb camouflage, cloak, conceal, cover, defend, disguise, fence, harbor, haven, hide, mask, protect, safeguard, shade, shelter, shield, shroud, veil II (select) verb choose, class, classify, discard, discriminate, eliminate, evaluate,… …   Law dictionary

  • screen —    , screen pipe    Slotted well casing that is positioned within the producing horizon to prevent the inflow of detrital particles into a well while allowing the inflow of water.    See also well screen …   Lexicon of Cave and Karst Terminology


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