touchstone Definition
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touchstone
noun
- 1. A hard black flint-like stone that is used for testing the purity and quality of gold and silver alloys according to the colour of the mark which is left when the alloy is rubbed on this stone.
2. A test or standard for judging the quality of something.
- Thesaurus: gauge, norm, standard, measure, criterion, yardstick, benchmark.
