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1. Oxford American Dictionary

   touchstone

   • IPA[ˈtəCHˌstōn]

   美式

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

   • noun: touchstone, plural noun: touchstones

2. • 釋義

   n.

   名詞

   • 1. a piece of fine-grained dark schist or jasper formerly used for testing alloys of gold by observing the color 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