See Also: Chaff(medicine)
chaff(1)(dictionary)
chaff(2)(dictionary)
chaff(dictionary)
rhizome chaff(medicine)
screen(dictionary)
help screen(dictionary)
screen(2)(dictionary)
screen(1)(dictionary)
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chaff(1) (iou) and screen (medicine)


chaff(1) (iou)



chaff noun1 & verb1.

A. noun.
The husks of corn etc. separated from the grain by threshing or winnowing. OE.
Cut hay (and straw) used for feeding cattle. OE.
transf. Refuse, worthless stuff or residue. LME.
Botany. Thin dry bracts or scales, esp. the bracts at the base of the florets in plants of the composite family. L18.
Strips of metal foil released in the air to obstruct radar detection. M20.
Phrases: be caught with chaff be easily deceived or trapped. separate the wheat from the chaff fig. distinguish good from bad.
Comb.: chaff-cutter a machine for cutting hay and straw.
b. verb trans. Cut (hay etc.) for fodder. L19.

screen (medicine)


screen


1. To provide with a shelter or means of concealment; to separate or cut off from inconvience, injury, or danger; to shelter; to protect; to protect by hiding; to conceal; as, fruits screened from cold winds by a forest or hill. "They were encouraged and screened by some who were in high comands." (Macaulay)

2. To pass, as coal, gravel, ashes, etc, through a screen in order to separate the coarse from the fine, or the worthless from the valuable; to sift. 3. To examine a group of objects methodically, to separate them into groups or to select one or more for some purpose. As (a), To inspect the qualifications of candidates for a job, to select one or more to be hired. (b) (Biochem, Med) To test a large number of samples, in order to find those having specific desirable properties; as, to screen plant extracts for anticancer agents.

Origin: Screened; Screening.

1. Anything that separates or cuts off inconvience, injury, or danger; that which shelters or conceals from view; a shield or protection; as, a fire screen. "Your leavy screens throw down." (Shak) "Some ambitious men seem as screens to princes in matters of danger and envy." (Bacon)

2. A dwarf wall or partition carried up to a certain height for separation and protection, as in a church, to separate the aisle from the choir, or the like.

3. A surface, as that afforded by a curtain, sheet, wall, etc, upon which an image, as a picture, is thrown by a Magic lantern, solar microscope, etc.

4. A long, coarse riddle or sieve, sometimes a revolving perforated cylinder, used to separate the coarser from the finer parts, as of coal, sand, gravel, and the like. 5. A netting, usu. Of metal, contained in a frame, used mostly in windows or doors to allow in fresh air while excluding insects. Screen door, a door of which half or more is composed of a screen. Screen window, a screen fitted for insertion into a window frame. 6. The surface of an electronic device, as a Television set or computer monitor, on which a visible image is formed. The screen is frequently the surface of a cathode-ray tube containing phosphors excited by the electron beam, but Other methods for causing an image to appear on the screen are also used, as in flat-panel displays. 7. The motion-picture industry; motion pictures. "A star of stage and screen."

Origin: OE. Scren, OF. Escrein, escran, F. Ecran, of uncertain origin; cf. G. Schirm a screen, OHG. Scrim, scern a protection, shield, or G. Schragen a trestle, a stack of wood, or G. Schranne a railing.

Source: Websters Dictionary