touchstone
Pronunciation:
/ˈtʌtʃstəʊn/noun
Definitions
A stone used to check the quality of gold alloys by rubbing them to leave a visible trace.
(by extension) A standard of comparison or evaluation.
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/ˈtʌtʃstəʊn/Definitions
A stone used to check the quality of gold alloys by rubbing them to leave a visible trace.
(by extension) A standard of comparison or evaluation.