dioptre definition, dioptre meaning | English dictionary

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dioptre

  
,   (U.S.)   diopter  
      n   a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres  
     (C16: from Latin dioptra optical instrument, from Greek, from dia- through + opsesthai to see)  
  dioptral      adj  
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