TOUCHSTONE


Meaning of TOUCHSTONE in English

[touch.stone] n (1530) 1: a black siliceous stone related to flint and formerly used to test the purity of gold and silver by the streak left on the stone when rubbed by the metal

2: a test or criterion for determining the quality or genuineness of a thing

3: a fundamental or quintessential part or feature syn see standard

Merriam-Webster English vocab.      Английский словарь Merriam Webster.