Touchstone
noun
1.
a test or criterion for the qualities of a thing.
2.
a black siliceous stone formerly used to test the purity of gold and silver by the color of the streak produced on it by rubbing it with either metal.
noun
1.
a criterion or standard by which judgment is made
2.
a hard dark siliceous stone, such as basalt or jasper, that is used to test the quality of gold and silver from the colour of the streak they produce on it
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adjective 1. of or relating to a tone-dialing system or a push-button phone operating on tone dialing. noun 2. (sometimes initial capital letter) a tone-dialing system. 3. a telephone utilizing this system. adjective 1. of or relating to a telephone dialling system in which each of the buttons pressed generates a tone of a different […]
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