American English

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

     

    fool's gold

     noun
    noun
     
    [uncountable]
     
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  1. 1a yellow mineral found in rock, which looks like gold but is not valuable, also callediron pyrites see also pyrite
  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 Learner's Dictionary entry: fool's gold