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(n.) Any test or criterion by which the qualities of a thing are tried.
(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.
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Webster, Noah. Entry for 'Touchstone'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/touchstone.html. 1828.