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n. A hard black stone, such as jasper or basalt, formerly used to test the quality of gold or silver by comparing the streak left on the stone by one of these metals with that of a standard alloy.

n. An excellent quality or example that is used to test the excellence or genuineness of others: "the qualities of courage and vision that are the touchstones of leadership” ( Henry A. Kissinger). See Synonyms at standard.

n. A stone used to test the quality of gold alloys.

n. A standard of comparison or evaluation.

n. Lydian stone; basanite; -- so called because used to test the purity of gold and silver by the streak which is left upon the stone when it is rubbed by the metal. See basanite.

n. Any test or criterion by which the qualities of a thing are tried.

n. A very fine-grained dark-colored variety of schist or jasper, used for trying the quality of alloys of the precious metals.

n. Any test or criterion by which the qualities of a thing are tried: as, money, the touchstone of common honesty.

n. a basis for comparison; a reference point against which other things can be evaluated

"Situated alongside the River Thames, the iconic power plant has been featured in works by The Who, Pink Floyd and The Beatles, and now this cultural touchstone is being retrofitted into a self-sufficent community powered by a zero-carbon energy plant."

metric    system of measurement   

basanite   

scale    medium of exchange    ordered series    earned run average    GPA    graduated table    Procrustean bed    era    standard of measurement    procrustean rule   

basanite   

certitude