Definition from Wiktionary, the free dictionary
See also: Touchstone
touchstone (plural touchstones)
- A stone used to check the quality of gold alloys by rubbing them to leave a visible trace.
- (figuratively, by extension) A standard of comparison or evaluation.
- The foregoing doctrine affords us also a touchstone for the trial of spirits.
A stone used to test the quality of gold alloys
A standard of comparison or evaluation