Touchstone meaning

tŭchstōn
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An excellent quality or example that is used to test the excellence or genuineness of others.
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Something by which others of its kind are measured or recognized; quintessential example or feature.
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A hard black stone, such as jasper or basalt, formerly used to test the quality of gold or silver by comparing the streak left on the stone by one of these metals with that of a standard alloy.
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A type of black stone formerly used to test the purity of gold or silver by the streak left on it when it was rubbed with the metal.
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A stone used to test the quality of gold alloys.
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A standard of comparison or evaluation.
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