English to English

touchstone

('t/@/t/S/st/oU/n )

a basis for comparison; a reference point against which other things can be evaluated(noun.communication)

Synonym:
criterion, measure, standard

source: wordnet30
Lydian stone; basanite; -- so called because used to test the purity of gold and silver by the streak which is left upon the stone when it is rubbed by the metal. See Basanite.(noun)

source: webster1913

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