Webster's English Dictionary

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mirage

Cross references:
  1. delusion              
 
mi.rage \m*-'ra:zh\ n [F, fr. mirer to look at, fr. L mirari] 1a: an 
   optical phenomenon produced by a layer of heated air of varying dens ity 
   across which are seen usu. inverted reflections of distant objects 1b: an 
   atmospheric phenomenon in which the air appears to move in ascending  waves 
   2: something illusory and unattainable like a mirage