Touchstone
/tˈʌˌtʃstoʊn/
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Definition
(noun) A stone used to verify the quality of gold alloys by rubbing them in order to leave a visible trace.
Sentence Examples
His first book became a touchstone for many future writers.
A touchstone is a standard by which something is judged or valued.
CEFR Practice Quiz
The ancient constitution remains a ____ for the legal system, providing a basis for many modern laws today.