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counterexample

[koun-ter-ig-zam-puh l, -zahm-]
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noun
  1. an example that refutes an assertion or claim.

Origin of counterexample

First recorded in 1955–60; counter- + example
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for counterexample

counterexample

noun
  1. an example or fact that is inconsistent with a hypothesis and may be used in argument against it
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