noun

touchstone

criterion, standard, benchmark

This novel is a touchstone of modern literature.

This novel is a touchstone of modern literature.

Honesty is the touchstone of his character.

Honesty is the touchstone of his character.

a touchstone ((of/for sth.)) a standard for something This novel is a touchstone of modern literature.

Synonyms: standard, criterion, benchmark, yardstick

From 'touch' + 'stone'. Historically, a touchstone was a dark stone used to test the purity of gold by the streak left on it.

Imagine using a special 'stone' to 'touch' something to see if it's genuine. That stone is your standard for judgment.

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