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Touchstone
/ˈtʌtʃstəʊn/
A stone used to check the quality of gold alloys by rubbing them to leave a visible trace.
📖 Definitions of "Touchstone"
noun
- 1
A stone used to check the quality of gold alloys by rubbing them to leave a visible trace.
- 2
(by extension) A standard of comparison or evaluation.
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