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touchstone

['tʌʧstəun] Sub.
Allg. Probierstein m; Prüfstein m; Maßstab Qualität
Bergb. Lydit m; Lydischer Stein
Metall. Basanit m
Tech. schwarzer Kieselschiefer
touchstones Sub.
Allg. Probiersteine m; Prüfsteine m
 Englisch Thesaurus
touchstone ['tʌʧstəun] Sub.
Allg. (A.Rezvov); a fundamental or quintessential part or feature : basis (merriam-webster.com A.Rezvov); a test or criterion for determining the quality or genuineness of a thing (merriam-webster.com A.Rezvov); a black siliceous stone related to flint that is used to test the purity of gold and formerly silver by the streak left on the stone when rubbed by the metal (merriam-webster.com A.Rezvov)