counterexample

[ koun-ter-ig-zam-puh l, -zahm- ]
/ ˈkaʊn tər ɪgˌzæm pəl, -ˌzɑm- /

noun

an example that refutes an assertion or claim.

Origin of counterexample

First recorded in 1955–60; counter- + example

British Dictionary definitions for counterexample

counterexample
/ (ˈkaʊntərɪɡˌzɑːmpəl) /

noun

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