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  1. touchstone

    • IPA[ˈtʌtʃstəʊn]

    英式

    • n.
      a piece of fine-grained dark schist or jasper formerly used for testing alloys of gold by observing the colour of the mark which they made on it.;a standard or criterion by which something is judged or recognized
    • noun: touchstone, plural noun: touchstones

    • 釋義

    名詞

    • 1. a piece of fine-grained dark schist or jasper formerly used for testing alloys of gold by observing the colour of the mark which they made on it.
    • a standard or criterion by which something is judged or recognized they tend to regard grammar as the touchstone of all language performance