Definition of fool’s gold noun from the Oxford Advanced Learner's Dictionary

     

    fool’s gold

     noun
    noun
    BrE
     
    ; NAmE
     
    [uncountable]
     
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  1. 1 a yellow mineral found in rock, which looks like gold but is not valuable, also called iron pyrites see also pyrites
  2. 2something that you think is valuable or will earn you a lot of money, but which has no chance of succeeding
See the Oxford Advanced American Dictionary entry: fool’s gold