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3 definitions found
 for screening
From The Collaborative International Dictionary of English v.0.48 :

  Screening \Screen"ing\ (skr[=e]n"[i^]ng), n.
     the process of examining or testing objects methodically to
     find those having desirable properties. See screen[3].
  
     Note: In the pharmaceutical industry, pharmaceutical
           screening involves testing a large number of samples of
           substances to find those having desirable
           pharmacological activity; those samples which have the
           property sought are called active or positive in the
           screen. The substances tested may be pure compounds
           with known structure, mixtures of pure compounds, or
           complex mixtures obtained by extraction from living
           organisms. There are often additional sets of test
           performed on active samples, called
  
     counterscreening to eliminate those samples that may also
        possess undesirable properties. In the case of screening
        of mixtures from living organisms, a type of
        counterscreening called dereplication is usually
        performed, to determine if the active sample contains a
        known compound which has previously been studied.
        [PJC]

From The Collaborative International Dictionary of English v.0.48 :

  Screen \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 conceal;
        as, fruits screened from cold winds by a forest or hill.
        [1913 Webster]
  
              They were encouraged and screened by some who were
              in high commands.                     --Macaulay.
        [1913 Webster]
  
     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.
        [1913 Webster]
  
     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.
            [PJC]

From WordNet (r) 3.0 (2006) :

  screening
      n 1: the display of a motion picture [syn: screening,
           showing, viewing]
      2: fabric of metal or plastic mesh
      3: the act of concealing the existence of something by
         obstructing the view of it; "the cover concealed their guns
         from enemy aircraft" [syn: cover, covering, screening,
         masking]
      4: testing objects or persons in order to identify those with
         particular characteristics

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