transcription, транскрипция: [ ˈtəch-ˌstōn ]
noun
Date: 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 : basis
a touchstone film of that decade
now considered a touchstone of the city's life — Michael Specter
Synonyms: see standard