Definition of touchstone noun from the Oxford Advanced Learner's Dictionary

 

touchstone

 noun
noun
BrE BrE//ˈtʌtʃstəʊn//
 
; NAmE NAmE//ˈtʌtʃstoʊn//
 
 
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[usually singular] touchstone (of/for something) (formal) something that provides a standard against which other things are compared and/or judged the touchstone for qualityExtra examples Grammar was regarded as the touchstone of all language performance. He has been a guiding beacon in my life and a touchstone of human integrity. She remained for them a touchstone of good sense. The nineteenth-century struggle to reconstitute Poland was a touchstone for liberals and socialists alike. The way medicines are sold has become one of the touchstone issues of modern capitalism.
See the Oxford Advanced American Dictionary entry: touchstone