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A stone used to check the quality of gold alloys by rubbing them to leave a visible trace. / (figuratively, by extension) A standard of comparison or evaluation.

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touchstone

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touchstone

/ˈtʌt͡ʃstəʊn/

noun

A stone used to check the quality of gold alloys by rubbing them to leave a visible trace. / (figuratively, by extension) A standard of comparison or evaluation.