touchstone

== English == === Etymology === From touch +‎ stone. === Pronunciation === IPA(key): /ˈtʌt͡ʃstəʊn/ === Noun === touchstone (plural touchstones) A stone used to verify the quality of gold alloys by rubbing them in order to leave a visible trace. (figurative, by extension) A standard of comparison or evaluation. Near-synonym: comparator ==== Translations ==== ==== See also ==== === Anagrams === touch-tones, touchtones