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fool's gold

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noun
  1. iron or copper pyrites, sometimes mistaken for gold.

Origin of fool's gold

An Americanism dating back to 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for fool's gold

fool's gold

noun
  1. any of various yellow minerals, esp pyrite or chalcopyrite, that can be mistaken for gold
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

fool's gold in Science

fool's gold

[fōōlz]
  1. Any of several minerals, especially pyrite and chalcopyrite, sometimes mistaken for gold.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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