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Collins

contrast

  

      vb  
1    often foll by: with   to distinguish or be distinguished by comparison of unlike or opposite qualities  
      n  
2    distinction or emphasis of difference by comparison of opposite or dissimilar things, qualities, etc. (esp. in the phrases by contrast, in contrast to or with)  
3    a person or thing showing notable differences when compared with another  
4    (in painting) the effect of the juxtaposition of different colours, tones, etc.  
5   
a    (of a photographic emulsion) the degree of density measured against exposure used  
b    the extent to which adjacent areas of an optical image, esp. on a television screen or in a photographic negative or print, differ in brightness  
6      (Psychol)   the phenomenon that when two different but related stimuli are presented close together in space and/or time they are perceived as being more different than they really are  
     (C16: (n): via French from Italian, from contrastare (vb), from Latin contra- against + stare to stand)  
  contrastable      adj  
  contrastably      adv  
   contrasting             adj  
  contrastive      adj  
  contrastively      adv  


colour contrast  
      n     (Psychol)   the change in the appearance of a colour surrounded by another colour; for example, grey looks bluish if surrounded by yellow  
contrast medium  
      n     (Med)   a radiopaque substance, such as barium sulphate, used to increase the contrast of an image in radiography  
phase-contrast microscope  
      n   a microscope that makes visible details of colourless transparent objects. It employs a method of illumination such that small differences of refractive index of the materials in the object cause differences of luminous intensity by interference  
Dictionnaire anglais Collins English definition-Thesaurus  
Consulter aussi:

contrast, contain, contraction, contraption

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