Definition of Touchstone
Touchstone
touch·stone
Definition/Meaning
(noun)
the basis of something, an essential or fundamental feature or part of it;
e.g. Her work formed the touchstone for future research in the field.
(noun)
a criterion, test, or standard by which something is recognized or judged, especially for genuineness or quality;
e.g. His writing is considered the touchstone for beginners in the genre.
(noun)
a dark/black fine-grained stone that was formerly used to test precious metals (silver and gold) or alloys containing these metals;
e.g. He rubbed a touchstone on the sample to test its purity.
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