a black flintlike siliceous stone that when rubbed by gold or silver shows a streak of colour, formerly used to test the purity of these metals
a test or criterion for determining the genuineness of something
| 单词 | touchstone |
| 释义 | touchstonenouna black flintlike siliceous stone that when rubbed by gold or silver shows a streak of colour, formerly used to test the purity of these metals a test or criterion for determining the genuineness of something |
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